diff --git a/deps/base64/base64.gyp b/deps/base64/base64.gyp
index 06b20a142b1..5d0a0c05dc2 100644
--- a/deps/base64/base64.gyp
+++ b/deps/base64/base64.gyp
@@ -49,6 +49,7 @@
             'HAVE_SSE42=1',
             'HAVE_AVX=1',
             'HAVE_AVX2=1',
+            'HAVE_AVX512=1',
           ],
           'dependencies': [
             'base64_ssse3',
@@ -56,6 +57,7 @@
             'base64_sse42',
             'base64_avx',
             'base64_avx2',
+            'base64_avx512',
           ],
         }, {
           'sources': [
@@ -64,6 +66,7 @@
             'base64/lib/arch/sse42/codec.c',
             'base64/lib/arch/avx/codec.c',
             'base64/lib/arch/avx2/codec.c',
+            'base64/lib/arch/avx512/codec.c',
           ],
         }],
       ],
@@ -165,6 +168,30 @@
       ],
     },
 
+    {
+      'target_name': 'base64_avx512',
+      'type': 'static_library',
+      'include_dirs': [ 'base64/include', 'base64/lib' ],
+      'sources': [ 'base64/lib/arch/avx512/codec.c' ],
+      'defines': [ 'BASE64_STATIC_DEFINE', 'HAVE_AVX512=1' ],
+      'conditions': [
+        [ 'OS!="win"', {
+          'cflags': [ '-mavx512vl', '-mavx512vbmi' ],
+          'xcode_settings': {
+            'OTHER_CFLAGS': [ '-mavx512vl', '-mavx512vbmi' ]
+          },
+        }, {
+          'msvs_settings': {
+            'VCCLCompilerTool': {
+              'AdditionalOptions': [
+                '/arch:AVX512'
+              ],
+            },
+          },
+        }],
+      ],
+    },
+
     {
       'target_name': 'base64_neon32',
       'type': 'static_library',
diff --git a/deps/base64/base64/.gitignore b/deps/base64/base64/.gitignore
index 837a2306a62..bb7b160deb3 100644
--- a/deps/base64/base64/.gitignore
+++ b/deps/base64/base64/.gitignore
@@ -1,12 +1 @@
-*.o
-bin/base64
-lib/config.h
-test/benchmark
-test/test_base64
-
-# visual studio symbol db, etc.
-.vs/
-# build directory used by CMakePresets
-out/
-# private cmake presets
-CMakeUserPresets.json
+# Intentionally empty
diff --git a/deps/base64/base64/CMakeLists.txt b/deps/base64/base64/CMakeLists.txt
index 56076e47a6a..be1de665a2c 100644
--- a/deps/base64/base64/CMakeLists.txt
+++ b/deps/base64/base64/CMakeLists.txt
@@ -17,7 +17,7 @@ if (POLICY CMP0127)
     cmake_policy(SET CMP0127 NEW)
 endif()
 
-project(base64 LANGUAGES C VERSION 0.5.0)
+project(base64 LANGUAGES C VERSION 0.5.1)
 
 include(GNUInstallDirs)
 include(CMakeDependentOption)
@@ -62,6 +62,8 @@ cmake_dependent_option(BASE64_WITH_AVX "add AVX codepath" ON ${_IS_X86} OFF)
 add_feature_info(AVX BASE64_WITH_AVX "add AVX codepath")
 cmake_dependent_option(BASE64_WITH_AVX2 "add AVX 2 codepath" ON ${_IS_X86} OFF)
 add_feature_info(AVX2 BASE64_WITH_AVX2 "add AVX2 codepath")
+cmake_dependent_option(BASE64_WITH_AVX512 "add AVX 512 codepath" ON ${_IS_X86} OFF)
+add_feature_info(AVX512 BASE64_WITH_AVX512 "add AVX512 codepath")
 
 cmake_dependent_option(BASE64_WITH_NEON32 "add NEON32 codepath" OFF _TARGET_ARCH_arm OFF)
 add_feature_info(NEON32 BASE64_WITH_NEON32 "add NEON32 codepath")
@@ -118,6 +120,7 @@ add_library(base64
     lib/arch/sse42/codec.c
     lib/arch/avx/codec.c
     lib/arch/avx2/codec.c
+    lib/arch/avx512/codec.c
 
     lib/arch/neon32/codec.c
     lib/arch/neon64/codec.c
@@ -206,6 +209,7 @@ if (_TARGET_ARCH STREQUAL "x86" OR _TARGET_ARCH STREQUAL "x64")
     configure_codec(SSE42 __SSSE4_2__)
     configure_codec(AVX)
     configure_codec(AVX2)
+    configure_codec(AVX512)
 
 elseif (_TARGET_ARCH STREQUAL "arm")
     set(BASE64_NEON32_CFLAGS "${COMPILE_FLAGS_NEON32}" CACHE STRING "the NEON32 compile flags (for 'lib/arch/neon32/codec.c')")
diff --git a/deps/base64/base64/LICENSE b/deps/base64/base64/LICENSE
index 9446393a82a..109d6521b12 100644
--- a/deps/base64/base64/LICENSE
+++ b/deps/base64/base64/LICENSE
@@ -1,7 +1,7 @@
 Copyright (c) 2005-2007, Nick Galbreath
-Copyright (c) 2013-2019, Alfred Klomp
-Copyright (c) 2015-2017, Wojciech Mula
+Copyright (c) 2015-2018, Wojciech Muła
 Copyright (c) 2016-2017, Matthieu Darbois
+Copyright (c) 2013-2022, Alfred Klomp
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
diff --git a/deps/base64/base64/Makefile b/deps/base64/base64/Makefile
index 2bb01e204fc..bcb944551ae 100644
--- a/deps/base64/base64/Makefile
+++ b/deps/base64/base64/Makefile
@@ -4,6 +4,7 @@ CFLAGS += -std=c99 -O3 -Wall -Wextra -pedantic
 OBJCOPY ?= objcopy
 
 OBJS = \
+  lib/arch/avx512/codec.o \
   lib/arch/avx2/codec.o \
   lib/arch/generic/codec.o \
   lib/arch/neon32/codec.o \
@@ -16,6 +17,7 @@ OBJS = \
   lib/codec_choose.o \
   lib/tables/tables.o
 
+HAVE_AVX512 = 0
 HAVE_AVX2   = 0
 HAVE_NEON32 = 0
 HAVE_NEON64 = 0
@@ -26,6 +28,9 @@ HAVE_AVX    = 0
 
 # The user should supply compiler flags for the codecs they want to build.
 # Check which codecs we're going to include:
+ifdef AVX512_CFLAGS
+  HAVE_AVX512 = 1
+endif
 ifdef AVX2_CFLAGS
   HAVE_AVX2 = 1
 endif
@@ -64,7 +69,8 @@ lib/libbase64.o: $(OBJS)
 	$(OBJCOPY) --keep-global-symbols=lib/exports.txt $@
 
 lib/config.h:
-	@echo "#define HAVE_AVX2   $(HAVE_AVX2)"    > $@
+	@echo "#define HAVE_AVX512 $(HAVE_AVX512)"  > $@
+	@echo "#define HAVE_AVX2   $(HAVE_AVX2)"   >> $@
 	@echo "#define HAVE_NEON32 $(HAVE_NEON32)" >> $@
 	@echo "#define HAVE_NEON64 $(HAVE_NEON64)" >> $@
 	@echo "#define HAVE_SSSE3  $(HAVE_SSSE3)"  >> $@
@@ -75,6 +81,7 @@ lib/config.h:
 $(OBJS): lib/config.h
 $(OBJS): CFLAGS += -Ilib
 
+lib/arch/avx512/codec.o: CFLAGS += $(AVX512_CFLAGS)
 lib/arch/avx2/codec.o:   CFLAGS += $(AVX2_CFLAGS)
 lib/arch/neon32/codec.o: CFLAGS += $(NEON32_CFLAGS)
 lib/arch/neon64/codec.o: CFLAGS += $(NEON64_CFLAGS)
diff --git a/deps/base64/base64/README.md b/deps/base64/base64/README.md
index b953c324c9d..ae0a914965e 100644
--- a/deps/base64/base64/README.md
+++ b/deps/base64/base64/README.md
@@ -3,7 +3,7 @@
 [![Build Status](https://github.com/aklomp/base64/actions/workflows/test.yml/badge.svg)](https://github.com/aklomp/base64/actions/workflows/test.yml)
 
 This is an implementation of a base64 stream encoding/decoding library in C99
-with SIMD (AVX2, NEON, AArch64/NEON, SSSE3, SSE4.1, SSE4.2, AVX) and
+with SIMD (AVX2, AVX512, NEON, AArch64/NEON, SSSE3, SSE4.1, SSE4.2, AVX) and
 [OpenMP](http://www.openmp.org) acceleration. It also contains wrapper functions
 to encode/decode simple length-delimited strings. This library aims to be:
 
@@ -19,6 +19,10 @@ will pick an optimized codec that lets it encode/decode 12 or 24 bytes at a
 time, which gives a speedup of four or more times compared to the "plain"
 bytewise codec.
 
+AVX512 support is only for encoding at present, utilizing the AVX512 VL and VBMI
+instructions. Decoding part reused AVX2 implementations. For CPUs later than
+Cannonlake (manufactured in 2018) supports these instructions.
+
 NEON support is hardcoded to on or off at compile time, because portable
 runtime feature detection is unavailable on ARM.
 
@@ -59,6 +63,9 @@ optimizations described by Wojciech Muła in a
 [articles](http://0x80.pl/notesen/2016-01-17-sse-base64-decoding.html).
 His own code is [here](https://github.com/WojciechMula/toys/tree/master/base64).
 
+The AVX512 encoder is based on code from Wojciech Muła's
+[base64simd](https://github.com/WojciechMula/base64simd) library.
+
 The OpenMP implementation was added by Ferry Toth (@htot) from [Exalon Delft](http://www.exalondelft.nl).
 
 ## Building
@@ -76,8 +83,8 @@ To compile just the "plain" library without SIMD codecs, type:
 make lib/libbase64.o
 ```
 
-Optional SIMD codecs can be included by specifying the `AVX2_CFLAGS`, `NEON32_CFLAGS`, `NEON64_CFLAGS`,
-`SSSE3_CFLAGS`, `SSE41_CFLAGS`, `SSE42_CFLAGS` and/or `AVX_CFLAGS` environment variables.
+Optional SIMD codecs can be included by specifying the `AVX2_CFLAGS`, `AVX512_CFLAGS`,
+`NEON32_CFLAGS`, `NEON64_CFLAGS`, `SSSE3_CFLAGS`, `SSE41_CFLAGS`, `SSE42_CFLAGS` and/or `AVX_CFLAGS` environment variables.
 A typical build invocation on x86 looks like this:
 
 ```sh
@@ -93,6 +100,15 @@ Example:
 AVX2_CFLAGS=-mavx2 make
 ```
 
+### AVX512
+
+To build and include the AVX512 codec, set the `AVX512_CFLAGS` environment variable to a value that will turn on AVX512 support in your compiler, typically `-mavx512vl -mavx512vbmi`.
+Example:
+
+```sh
+AVX512_CFLAGS="-mavx512vl -mavx512vbmi" make
+```
+
 The codec will only be used if runtime feature detection shows that the target machine supports AVX2.
 
 ### SSSE3
@@ -208,6 +224,7 @@ Mainly there for testing purposes, this is also useful on ARM where the only way
 The following constants can be used:
 
 - `BASE64_FORCE_AVX2`
+- `BASE64_FORCE_AVX512`
 - `BASE64_FORCE_NEON32`
 - `BASE64_FORCE_NEON64`
 - `BASE64_FORCE_PLAIN`
@@ -434,7 +451,7 @@ x86 processors
 | i7-4770 @ 3.4 GHz DDR1600 OPENMP 4 thread | 4884\*    | 7099\*    | 4917\*    | 7057\*    | 4799\*  | 7143\*  | 4902\*   | 7219\*   |
 | i7-4770 @ 3.4 GHz DDR1600 OPENMP 8 thread | 5212\*    | 8849\*    | 5284\*    | 9099\*    | 5289\*  | 9220\*  | 4849\*   | 9200\*   |
 | i7-4870HQ @ 2.5 GHz                       | 1471\*    | 3066\*    | 6721\*    | 6962\*    | 7015\*  | 8267\*  | 8328\*   | 11576\*  |
-| i5-4590S @ 3.0 GHz                        | 3356      | 3197      | 4363      | 6104      | 4243    | 6233    | 4160     | 6344     |
+| i5-4590S @ 3.0 GHz                        | 3356      | 3197      | 4363      | 6104      | 4243\*  | 6233    | 4160\*   | 6344     |
 | Xeon X5570 @ 2.93 GHz                     | 2161      | 1508      | 3160      | 3915      | -       | -       | -        | -        |
 | Pentium4 @ 3.4 GHz                        | 896       | 740       | -         | -         | -       | -       | -        | -        |
 | Atom N270                                 | 243       | 266       | 508       | 387       | -       | -       | -        | -        |
diff --git a/deps/base64/base64/bin/base64.c b/deps/base64/base64/bin/base64.c
index e4384fe885d..98d6b3cbab5 100644
--- a/deps/base64/base64/bin/base64.c
+++ b/deps/base64/base64/bin/base64.c
@@ -1,128 +1,477 @@
-#include <stddef.h>	// size_t
-#include <stdio.h>	// fopen()
-#include <string.h>	// strlen()
+#define _XOPEN_SOURCE		// IOV_MAX
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
 #include <getopt.h>
+#include <errno.h>
+#include <limits.h>
+#include <sys/uio.h>
 #include "../include/libbase64.h"
 
-#define BUFSIZE 1024 * 1024
+// Size of the buffer for the "raw" (not base64-encoded) data in bytes.
+#define BUFFER_RAW_SIZE (1024 * 1024)
 
-static char buf[BUFSIZE];
-static char out[(BUFSIZE * 5) / 3];	// Technically 4/3 of input, but take some margin
-size_t nread;
-size_t nout;
+// Size of the buffer for the base64-encoded data in bytes. The base64-encoded
+// data is 4/3 the size of the input, with some margin to be sure.
+#define BUFFER_ENC_SIZE (BUFFER_RAW_SIZE * 4 / 3 + 16)
 
-static int
-enc (FILE *fp)
+// Global config structure.
+struct config {
+
+	// Name by which the program was called on the command line.
+	const char *name;
+
+	// Name of the input file for logging purposes.
+	const char *file;
+
+	// Input file handle.
+	FILE *fp;
+
+	// Wrap width in characters, for encoding only.
+	size_t wrap;
+
+	// Whether to run in decode mode.
+	bool decode;
+
+	// Whether to just print the help text and exit.
+	bool print_help;
+};
+
+// Input/output buffer structure.
+struct buffer {
+
+	// Runtime-allocated buffer for raw (unencoded) data.
+	char *raw;
+
+	// Runtime-allocated buffer for base64-encoded data.
+	char *enc;
+};
+
+static bool
+buffer_alloc (const struct config *config, struct buffer *buf)
 {
-	int ret = 1;
+	if ((buf->raw = malloc(BUFFER_RAW_SIZE)) == NULL ||
+	    (buf->enc = malloc(BUFFER_ENC_SIZE)) == NULL) {
+		free(buf->raw);
+		fprintf(stderr, "%s: malloc: %s\n",
+		        config->name, strerror(errno));
+		return false;
+	}
+
+	return true;
+}
+
+static void
+buffer_free (struct buffer *buf)
+{
+	free(buf->raw);
+	free(buf->enc);
+}
+
+static bool
+writev_retry (const struct config *config, struct iovec *iov, size_t nvec)
+{
+	// Writing nothing always succeeds.
+	if (nvec == 0) {
+		return true;
+	}
+
+	while (true) {
+		ssize_t nwrite;
+
+		// Try to write the vectors to stdout.
+		if ((nwrite = writev(1, iov, nvec)) < 0) {
+
+			// Retry on EINTR.
+			if (errno == EINTR) {
+				continue;
+			}
+
+			// Quit on other errors.
+			fprintf(stderr, "%s: writev: %s\n",
+				config->name, strerror(errno));
+			return false;
+		}
+
+		// The return value of `writev' is the number of bytes written.
+		// To check for success, we traverse the list and remove all
+		// written vectors. The call succeeded if the list is empty.
+		while (true) {
+
+			// Retry if this vector is not or partially written.
+			if (iov->iov_len > (size_t) nwrite) {
+				char *base = iov->iov_base;
+
+				iov->iov_base = (size_t) nwrite + base;
+				iov->iov_len -= (size_t) nwrite;
+				break;
+			}
+
+			// Move to the next vector.
+			nwrite -= iov->iov_len;
+			iov++;
+
+			// Return successfully if all vectors were written.
+			if (--nvec == 0) {
+				return true;
+			}
+		}
+	}
+}
+
+static inline bool
+iov_append (const struct config *config, struct iovec *iov,
+            size_t *nvec, char *base, const size_t len)
+{
+	// Add the buffer to the IO vector array.
+	iov[*nvec].iov_base = base;
+	iov[*nvec].iov_len  = len;
+
+	// Increment the array index. Flush the array if it is full.
+	if (++(*nvec) == IOV_MAX) {
+		if (writev_retry(config, iov, IOV_MAX) == false) {
+			return false;
+		}
+		*nvec = 0;
+	}
+
+	return true;
+}
+
+static bool
+write_stdout (const struct config *config, const char *buf, size_t len)
+{
+	while (len > 0) {
+		ssize_t nwrite;
+
+		// Try to write the buffer to stdout.
+		if ((nwrite = write(1, buf, len)) < 0) {
+
+			// Retry on EINTR.
+			if (errno == EINTR) {
+				continue;
+			}
+
+			// Quit on other errors.
+			fprintf(stderr, "%s: write: %s\n",
+			        config->name, strerror(errno));
+			return false;
+		}
+
+		// Update the buffer position.
+		buf += (size_t) nwrite;
+		len -= (size_t) nwrite;
+	}
+
+	return true;
+}
+
+static bool
+write_wrapped (const struct config *config, char *buf, size_t len)
+{
+	static size_t col = 0;
+
+	// Special case: if buf is NULL, print final trailing newline.
+	if (buf == NULL) {
+		if (config->wrap > 0 && col > 0) {
+			return write_stdout(config, "\n", 1);
+		}
+		return true;
+	}
+
+	// If no wrap width is given, write the entire buffer.
+	if (config->wrap == 0) {
+		return write_stdout(config, buf, len);
+	}
+
+	// Statically allocated IO vector buffer.
+	static struct iovec iov[IOV_MAX];
+	size_t nvec = 0;
+
+	while (len > 0) {
+
+		// Number of characters to fill the current line.
+		size_t nwrite = config->wrap - col;
+
+		// Do not write more data than is available.
+		if (nwrite > len) {
+			nwrite = len;
+		}
+
+		// Append the data to the IO vector array.
+		if (iov_append(config, iov, &nvec, buf, nwrite) == false) {
+			return false;
+		}
+
+		// Advance the buffer.
+		len -= nwrite;
+		buf += nwrite;
+		col += nwrite;
+
+		// If the line is full, append a newline.
+		if (col == config->wrap) {
+			if (iov_append(config, iov, &nvec, "\n", 1) == false) {
+				return false;
+			}
+			col = 0;
+		}
+	}
+
+	// Write the remaining vectors.
+	if (writev_retry(config, iov, nvec) == false) {
+		return false;
+	}
+
+	return true;
+}
+
+static bool
+encode (const struct config *config, struct buffer *buf)
+{
+	size_t nread, nout;
 	struct base64_state state;
 
+	// Initialize the encoder's state structure.
 	base64_stream_encode_init(&state, 0);
 
-	while ((nread = fread(buf, 1, BUFSIZE, fp)) > 0) {
-		base64_stream_encode(&state, buf, nread, out, &nout);
-		if (nout) {
-			fwrite(out, nout, 1, stdout);
-		}
-		if (feof(fp)) {
-			break;
-		}
-	}
-	if (ferror(fp)) {
-		fprintf(stderr, "read error\n");
-		ret = 0;
-		goto out;
-	}
-	base64_stream_encode_final(&state, out, &nout);
+	// Read raw data into the buffer.
+	while ((nread = fread(buf->raw, 1, BUFFER_RAW_SIZE, config->fp)) > 0) {
 
-	if (nout) {
-		fwrite(out, nout, 1, stdout);
+		// Encode the raw input into the encoded buffer.
+		base64_stream_encode(&state, buf->raw, nread, buf->enc, &nout);
+
+		// Append the encoded data to the output stream.
+		if (write_wrapped(config, buf->enc, nout) == false) {
+			return false;
+		}
 	}
-out:	fclose(fp);
-	fclose(stdout);
-	return ret;
+
+	// Check for stream errors.
+	if (ferror(config->fp)) {
+		fprintf(stderr, "%s: %s: read error\n",
+		        config->name, config->file);
+		return false;
+	}
+
+	// Finalize the encoding by adding proper stream terminators.
+	base64_stream_encode_final(&state, buf->enc, &nout);
+
+	// Append this tail to the output stream.
+	if (write_wrapped(config, buf->enc, nout) == false) {
+		return false;
+	}
+
+	// Print optional trailing newline.
+	if (write_wrapped(config, NULL, 0) == false) {
+		return false;
+	}
+
+	return true;
 }
 
 static int
-dec (FILE *fp)
+decode (const struct config *config, struct buffer *buf)
 {
-	int ret = 1;
+	size_t nread, nout;
 	struct base64_state state;
 
+	// Initialize the decoder's state structure.
 	base64_stream_decode_init(&state, 0);
 
-	while ((nread = fread(buf, 1, BUFSIZE, fp)) > 0) {
-		if (!base64_stream_decode(&state, buf, nread, out, &nout)) {
-			fprintf(stderr, "decoding error\n");
-			ret = 0;
-			goto out;
+	// Read encoded data into the buffer. Use the smallest buffer size to
+	// be on the safe side: the decoded output will fit the raw buffer.
+	while ((nread = fread(buf->enc, 1, BUFFER_RAW_SIZE, config->fp)) > 0) {
+
+		// Decode the input into the raw buffer.
+		if (base64_stream_decode(&state, buf->enc, nread,
+		                         buf->raw, &nout) == 0) {
+			fprintf(stderr, "%s: %s: decoding error\n",
+			        config->name, config->file);
+			return false;
 		}
-		if (nout) {
-			fwrite(out, nout, 1, stdout);
+
+		// Append the raw data to the output stream.
+		if (write_stdout(config, buf->raw, nout) == false) {
+			return false;
 		}
-		if (feof(fp)) {
+	}
+
+	// Check for stream errors.
+	if (ferror(config->fp)) {
+		fprintf(stderr, "%s: %s: read error\n",
+		       config->name, config->file);
+		return false;
+	}
+
+	return true;
+}
+
+static void
+usage (FILE *fp, const struct config *config)
+{
+	const char *usage =
+		"Usage: %s [OPTION]... [FILE]\n"
+		"If no FILE is given or is specified as '-', "
+		"read from standard input.\n"
+		"Options:\n"
+		"  -d, --decode     Decode a base64 stream.\n"
+		"  -h, --help       Print this help text.\n"
+		"  -w, --wrap=COLS  Wrap encoded lines at this column. "
+		"Default 76, 0 to disable.\n";
+
+	fprintf(fp, usage, config->name);
+}
+
+static bool
+get_wrap (struct config *config, const char *str)
+{
+	char *eptr;
+
+	// Reject empty strings.
+	if (*str == '\0') {
+		return false;
+	}
+
+	// Convert the input string to a signed long.
+	const long wrap = strtol(str, &eptr, 10);
+
+	// Reject negative numbers.
+	if (wrap < 0) {
+		return false;
+	}
+
+	// Reject strings containing non-digits.
+	if (*eptr != '\0') {
+		return false;
+	}
+
+	config->wrap = (size_t) wrap;
+	return true;
+}
+
+static bool
+parse_opts (int argc, char **argv, struct config *config)
+{
+	int c;
+	static const struct option opts[] = {
+		{ "decode", no_argument,       NULL, 'd' },
+		{ "help",   no_argument,       NULL, 'h' },
+		{ "wrap",   required_argument, NULL, 'w' },
+		{ NULL }
+	};
+
+	// Remember the program's name.
+	config->name = *argv;
+
+	// Parse command line options.
+	while ((c = getopt_long(argc, argv, ":dhw:", opts, NULL)) != -1) {
+		switch (c) {
+		case 'd':
+			config->decode = true;
 			break;
+
+		case 'h':
+			config->print_help = true;
+			return true;
+
+		case 'w':
+			if (get_wrap(config, optarg) == false) {
+				fprintf(stderr,
+				        "%s: invalid wrap value '%s'\n",
+				        config->name, optarg);
+				return false;
+			}
+			break;
+
+		case ':':
+			fprintf(stderr, "%s: missing argument for '%c'\n",
+			        config->name, optopt);
+			return false;
+
+		default:
+			fprintf(stderr, "%s: unknown option '%c'\n",
+			        config->name, optopt);
+			return false;
 		}
 	}
-	if (ferror(fp)) {
-		fprintf(stderr, "read error\n");
-		ret = 0;
+
+	// Return successfully if no filename was given.
+	if (optind >= argc) {
+		return true;
 	}
-out:	fclose(fp);
-	fclose(stdout);
-	return ret;
+
+	// Return unsuccessfully if more than one filename was given.
+	if (optind + 1 < argc) {
+		fprintf(stderr, "%s: too many files\n", config->name);
+		return false;
+	}
+
+	// For compatibility with GNU Coreutils base64, treat a filename of '-'
+	// as standard input.
+	if (strcmp(argv[optind], "-") == 0) {
+		return true;
+	}
+
+	// Save the name of the file.
+	config->file = argv[optind];
+
+	// Open the file.
+	if ((config->fp = fopen(config->file, "rb")) == NULL) {
+		fprintf(stderr, "%s: %s: %s\n",
+		        config->name, config->file, strerror(errno));
+		return false;
+	}
+
+	return true;
 }
 
 int
 main (int argc, char **argv)
 {
-	char *file;
-	FILE *fp;
-	int decode = 0;
+	// Default program config.
+	struct config config = {
+		.file       = "stdin",
+		.fp         = stdin,
+		.wrap       = 76,
+		.decode     = false,
+		.print_help = false,
+	};
+	struct buffer buf;
 
-	// Parse options:
-	for (;;)
-	{
-		int c;
-		int opt_index = 0;
-		static struct option opt_long[] = {
-			{ "decode", 0, 0, 'd' },
-			{ 0, 0, 0, 0 }
-		};
-		if ((c = getopt_long(argc, argv, "d", opt_long, &opt_index)) == -1) {
-			break;
-		}
-		switch (c)
-		{
-			case 'd':
-				decode = 1;
-				break;
-		}
-	}
-
-	// No options left on command line? Read from stdin:
-	if (optind >= argc) {
-		fp = stdin;
-	}
-
-	// One option left on command line? Treat it as a file:
-	else if (optind + 1 == argc) {
-		file = argv[optind];
-		if (strcmp(file, "-") == 0) {
-			fp = stdin;
-		}
-		else if ((fp = fopen(file, "rb")) == NULL) {
-			printf("cannot open %s\n", file);
-			return 1;
-		}
-	}
-
-	// More than one option left on command line? Syntax error:
-	else {
-		printf("Usage: %s <file>\n", argv[0]);
+	// Parse options from the command line.
+	if (parse_opts(argc, argv, &config) == false) {
+		usage(stderr, &config);
 		return 1;
 	}
 
-	// Invert return codes to create shell return code:
-	return (decode) ? !dec(fp) : !enc(fp);
+	// Return early if the user just wanted the help text.
+	if (config.print_help) {
+		usage(stdout, &config);
+		return 0;
+	}
+
+	// Allocate buffers.
+	if (buffer_alloc(&config, &buf) == false) {
+		return 1;
+	}
+
+	// Encode or decode the input based on the user's choice.
+	const bool ret = config.decode
+		? decode(&config, &buf)
+		: encode(&config, &buf);
+
+	// Free the buffers.
+	buffer_free(&buf);
+
+	// Close the input file.
+	fclose(config.fp);
+
+	// Close the output stream.
+	fclose(stdout);
+
+	// That's all, folks.
+	return ret ? 0 : 1;
 }
diff --git a/deps/base64/base64/cmake/Modules/TargetSIMDInstructionSet.cmake b/deps/base64/base64/cmake/Modules/TargetSIMDInstructionSet.cmake
index ba1f6e51815..48508090531 100644
--- a/deps/base64/base64/cmake/Modules/TargetSIMDInstructionSet.cmake
+++ b/deps/base64/base64/cmake/Modules/TargetSIMDInstructionSet.cmake
@@ -21,6 +21,7 @@ macro(define_SIMD_compile_flags)
         set(COMPILE_FLAGS_SSE42 "-msse4.2")
         set(COMPILE_FLAGS_AVX "-mavx")
         set(COMPILE_FLAGS_AVX2 "-mavx2")
+        set(COMPILE_FLAGS_AVX512 "-mavx512vl -mavx512vbmi")
 
         #arm
         set(COMPILE_FLAGS_NEON32 "-mfpu=neon")
@@ -30,5 +31,6 @@ macro(define_SIMD_compile_flags)
         set(COMPILE_FLAGS_SSE42 " ")
         set(COMPILE_FLAGS_AVX "/arch:AVX")
         set(COMPILE_FLAGS_AVX2 "/arch:AVX2")
+        set(COMPILE_FLAGS_AVX512 "/arch:AVX512")
     endif()
 endmacro(define_SIMD_compile_flags)
diff --git a/deps/base64/base64/cmake/config.h.in b/deps/base64/base64/cmake/config.h.in
index 8530d1e13d4..c7faa94bc09 100644
--- a/deps/base64/base64/cmake/config.h.in
+++ b/deps/base64/base64/cmake/config.h.in
@@ -16,6 +16,9 @@
 #cmakedefine01 BASE64_WITH_AVX2
 #define HAVE_AVX2 BASE64_WITH_AVX2
 
+#cmakedefine01 BASE64_WITH_AVX512
+#define HAVE_AVX512 BASE64_WITH_AVX512
+
 #cmakedefine01 BASE64_WITH_NEON32
 #define HAVE_NEON32 BASE64_WITH_NEON32
 
diff --git a/deps/base64/base64/include/libbase64.h b/deps/base64/base64/include/libbase64.h
index d470a82f102..c5908973c5e 100644
--- a/deps/base64/base64/include/libbase64.h
+++ b/deps/base64/base64/include/libbase64.h
@@ -53,6 +53,7 @@ extern "C" {
 #define BASE64_FORCE_SSE41	(1 << 5)
 #define BASE64_FORCE_SSE42	(1 << 6)
 #define BASE64_FORCE_AVX	(1 << 7)
+#define BASE64_FORCE_AVX512	(1 << 8)
 
 struct base64_state {
 	int eof;
diff --git a/deps/base64/base64/lib/arch/avx/codec.c b/deps/base64/base64/lib/arch/avx/codec.c
index a7a963d8358..b069618e294 100644
--- a/deps/base64/base64/lib/arch/avx/codec.c
+++ b/deps/base64/base64/lib/arch/avx/codec.c
@@ -11,11 +11,25 @@
 #if HAVE_AVX
 #include <immintrin.h>
 
+// Only enable inline assembly on supported compilers and on 64-bit CPUs.
+#ifndef BASE64_AVX_USE_ASM
+# if (defined(__GNUC__) || defined(__clang__)) && BASE64_WORDSIZE == 64
+#  define BASE64_AVX_USE_ASM 1
+# else
+#  define BASE64_AVX_USE_ASM 0
+# endif
+#endif
+
 #include "../ssse3/dec_reshuffle.c"
 #include "../ssse3/dec_loop.c"
-#include "../ssse3/enc_translate.c"
-#include "../ssse3/enc_reshuffle.c"
-#include "../ssse3/enc_loop.c"
+
+#if BASE64_AVX_USE_ASM
+# include "enc_loop_asm.c"
+#else
+# include "../ssse3/enc_translate.c"
+# include "../ssse3/enc_reshuffle.c"
+# include "../ssse3/enc_loop.c"
+#endif
 
 #endif	// HAVE_AVX
 
@@ -23,7 +37,17 @@ BASE64_ENC_FUNCTION(avx)
 {
 #if HAVE_AVX
 	#include "../generic/enc_head.c"
+
+	// For supported compilers, use a hand-optimized inline assembly
+	// encoder. Otherwise fall back on the SSSE3 encoder, but compiled with
+	// AVX flags to generate better optimized AVX code.
+
+#if BASE64_AVX_USE_ASM
+	enc_loop_avx(&s, &slen, &o, &olen);
+#else
 	enc_loop_ssse3(&s, &slen, &o, &olen);
+#endif
+
 	#include "../generic/enc_tail.c"
 #else
 	BASE64_ENC_STUB
diff --git a/deps/base64/base64/lib/arch/avx/enc_loop_asm.c b/deps/base64/base64/lib/arch/avx/enc_loop_asm.c
new file mode 100644
index 00000000000..979269af577
--- /dev/null
+++ b/deps/base64/base64/lib/arch/avx/enc_loop_asm.c
@@ -0,0 +1,264 @@
+// Apologies in advance for combining the preprocessor with inline assembly,
+// two notoriously gnarly parts of C, but it was necessary to avoid a lot of
+// code repetition. The preprocessor is used to template large sections of
+// inline assembly that differ only in the registers used. If the code was
+// written out by hand, it would become very large and hard to audit.
+
+// Generate a block of inline assembly that loads register R0 from memory. The
+// offset at which the register is loaded is set by the given round.
+#define LOAD(R0, ROUND) \
+	"vlddqu ("#ROUND" * 12)(%[src]), %["R0"] \n\t"
+
+// Generate a block of inline assembly that deinterleaves and shuffles register
+// R0 using preloaded constants. Outputs in R0 and R1.
+#define SHUF(R0, R1, R2) \
+	"vpshufb  %[lut0], %["R0"], %["R1"] \n\t" \
+	"vpand    %["R1"], %[msk0], %["R2"] \n\t" \
+	"vpand    %["R1"], %[msk2], %["R1"] \n\t" \
+	"vpmulhuw %["R2"], %[msk1], %["R2"] \n\t" \
+	"vpmullw  %["R1"], %[msk3], %["R1"] \n\t" \
+	"vpor     %["R1"], %["R2"], %["R1"] \n\t"
+
+// Generate a block of inline assembly that takes R0 and R1 and translates
+// their contents to the base64 alphabet, using preloaded constants.
+#define TRAN(R0, R1, R2) \
+	"vpsubusb %[n51],  %["R1"], %["R0"] \n\t" \
+	"vpcmpgtb %[n25],  %["R1"], %["R2"] \n\t" \
+	"vpsubb   %["R2"], %["R0"], %["R0"] \n\t" \
+	"vpshufb  %["R0"], %[lut1], %["R2"] \n\t" \
+	"vpaddb   %["R1"], %["R2"], %["R0"] \n\t"
+
+// Generate a block of inline assembly that stores the given register R0 at an
+// offset set by the given round.
+#define STOR(R0, ROUND) \
+	"vmovdqu %["R0"], ("#ROUND" * 16)(%[dst]) \n\t"
+
+// Generate a block of inline assembly that generates a single self-contained
+// encoder round: fetch the data, process it, and store the result. Then update
+// the source and destination pointers.
+#define ROUND() \
+	LOAD("a", 0) \
+	SHUF("a", "b", "c") \
+	TRAN("a", "b", "c") \
+	STOR("a", 0) \
+	"add $12, %[src] \n\t" \
+	"add $16, %[dst] \n\t"
+
+// Define a macro that initiates a three-way interleaved encoding round by
+// preloading registers a, b and c from memory.
+// The register graph shows which registers are in use during each step, and
+// is a visual aid for choosing registers for that step. Symbol index:
+//
+//  +  indicates that a register is loaded by that step.
+//  |  indicates that a register is in use and must not be touched.
+//  -  indicates that a register is decommissioned by that step.
+//  x  indicates that a register is used as a temporary by that step.
+//  V  indicates that a register is an input or output to the macro.
+//
+#define ROUND_3_INIT() 			/*  a b c d e f  */ \
+	LOAD("a",   0)			/*  +            */ \
+	SHUF("a", "d", "e")		/*  |     + x    */ \
+	LOAD("b",   1)			/*  | +   |      */ \
+	TRAN("a", "d", "e")		/*  | |   - x    */ \
+	LOAD("c",   2)			/*  V V V        */
+
+// Define a macro that translates, shuffles and stores the input registers A, B
+// and C, and preloads registers D, E and F for the next round.
+// This macro can be arbitrarily daisy-chained by feeding output registers D, E
+// and F back into the next round as input registers A, B and C. The macro
+// carefully interleaves memory operations with data operations for optimal
+// pipelined performance.
+
+#define ROUND_3(ROUND, A,B,C,D,E,F) 	/*  A B C D E F  */ \
+	LOAD(D, (ROUND + 3))		/*  V V V +      */ \
+	SHUF(B, E, F)			/*  | | | | + x  */ \
+	STOR(A, (ROUND + 0))		/*  - | | | |    */ \
+	TRAN(B, E, F)			/*    | | | - x  */ \
+	LOAD(E, (ROUND + 4))		/*    | | | +    */ \
+	SHUF(C, A, F)			/*  + | | | | x  */ \
+	STOR(B, (ROUND + 1))		/*  | - | | |    */ \
+	TRAN(C, A, F)			/*  -   | | | x  */ \
+	LOAD(F, (ROUND + 5))		/*      | | | +  */ \
+	SHUF(D, A, B)			/*  + x | | | |  */ \
+	STOR(C, (ROUND + 2))		/*  |   - | | |  */ \
+	TRAN(D, A, B)			/*  - x   V V V  */
+
+// Define a macro that terminates a ROUND_3 macro by taking pre-loaded
+// registers D, E and F, and translating, shuffling and storing them.
+#define ROUND_3_END(ROUND, A,B,C,D,E,F)	/*  A B C D E F  */ \
+	SHUF(E, A, B)			/*  + x   V V V  */ \
+	STOR(D, (ROUND + 3))		/*  |     - | |  */ \
+	TRAN(E, A, B)			/*  - x     | |  */ \
+	SHUF(F, C, D)			/*      + x | |  */ \
+	STOR(E, (ROUND + 4))		/*      |   - |  */ \
+	TRAN(F, C, D)			/*      - x   |  */ \
+	STOR(F, (ROUND + 5))		/*            -  */
+
+// Define a type A round. Inputs are a, b, and c, outputs are d, e, and f.
+#define ROUND_3_A(ROUND) \
+	ROUND_3(ROUND, "a", "b", "c", "d", "e", "f")
+
+// Define a type B round. Inputs and outputs are swapped with regard to type A.
+#define ROUND_3_B(ROUND) \
+	ROUND_3(ROUND, "d", "e", "f", "a", "b", "c")
+
+// Terminating macro for a type A round.
+#define ROUND_3_A_LAST(ROUND) \
+	ROUND_3_A(ROUND) \
+	ROUND_3_END(ROUND, "a", "b", "c", "d", "e", "f")
+
+// Terminating macro for a type B round.
+#define ROUND_3_B_LAST(ROUND) \
+	ROUND_3_B(ROUND) \
+	ROUND_3_END(ROUND, "d", "e", "f", "a", "b", "c")
+
+// Suppress clang's warning that the literal string in the asm statement is
+// overlong (longer than the ISO-mandated minimum size of 4095 bytes for C99
+// compilers). It may be true, but the goal here is not C99 portability.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Woverlength-strings"
+
+static inline void
+enc_loop_avx (const uint8_t **s, size_t *slen, uint8_t **o, size_t *olen)
+{
+	// For a clearer explanation of the algorithm used by this function,
+	// please refer to the plain (not inline assembly) implementation. This
+	// function follows the same basic logic.
+
+	if (*slen < 16) {
+		return;
+	}
+
+	// Process blocks of 12 bytes at a time. Input is read in blocks of 16
+	// bytes, so "reserve" four bytes from the input buffer to ensure that
+	// we never read beyond the end of the input buffer.
+	size_t rounds = (*slen - 4) / 12;
+
+	*slen -= rounds * 12;   // 12 bytes consumed per round
+	*olen += rounds * 16;   // 16 bytes produced per round
+
+	// Number of times to go through the 36x loop.
+	size_t loops = rounds / 36;
+
+	// Number of rounds remaining after the 36x loop.
+	rounds %= 36;
+
+	// Lookup tables.
+	const __m128i lut0 = _mm_set_epi8(
+		10, 11,  9, 10,  7,  8,  6,  7,  4,  5,  3,  4,  1,  2,  0,  1);
+
+	const __m128i lut1 = _mm_setr_epi8(
+		65, 71, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -19, -16, 0, 0);
+
+	// Temporary registers.
+	__m128i a, b, c, d, e, f;
+
+	__asm__ volatile (
+
+		// If there are 36 rounds or more, enter a 36x unrolled loop of
+		// interleaved encoding rounds. The rounds interleave memory
+		// operations (load/store) with data operations (table lookups,
+		// etc) to maximize pipeline throughput.
+		"    test %[loops], %[loops] \n\t"
+		"    jz   18f                \n\t"
+		"    jmp  36f                \n\t"
+		"                            \n\t"
+		".balign 64                  \n\t"
+		"36: " ROUND_3_INIT()
+		"    " ROUND_3_A( 0)
+		"    " ROUND_3_B( 3)
+		"    " ROUND_3_A( 6)
+		"    " ROUND_3_B( 9)
+		"    " ROUND_3_A(12)
+		"    " ROUND_3_B(15)
+		"    " ROUND_3_A(18)
+		"    " ROUND_3_B(21)
+		"    " ROUND_3_A(24)
+		"    " ROUND_3_B(27)
+		"    " ROUND_3_A_LAST(30)
+		"    add $(12 * 36), %[src] \n\t"
+		"    add $(16 * 36), %[dst] \n\t"
+		"    dec %[loops]           \n\t"
+		"    jnz 36b                \n\t"
+
+		// Enter an 18x unrolled loop for rounds of 18 or more.
+		"18: cmp $18, %[rounds] \n\t"
+		"    jl  9f             \n\t"
+		"    " ROUND_3_INIT()
+		"    " ROUND_3_A(0)
+		"    " ROUND_3_B(3)
+		"    " ROUND_3_A(6)
+		"    " ROUND_3_B(9)
+		"    " ROUND_3_A_LAST(12)
+		"    sub $18,        %[rounds] \n\t"
+		"    add $(12 * 18), %[src]    \n\t"
+		"    add $(16 * 18), %[dst]    \n\t"
+
+		// Enter a 9x unrolled loop for rounds of 9 or more.
+		"9:  cmp $9, %[rounds] \n\t"
+		"    jl  6f            \n\t"
+		"    " ROUND_3_INIT()
+		"    " ROUND_3_A(0)
+		"    " ROUND_3_B_LAST(3)
+		"    sub $9,        %[rounds] \n\t"
+		"    add $(12 * 9), %[src]    \n\t"
+		"    add $(16 * 9), %[dst]    \n\t"
+
+		// Enter a 6x unrolled loop for rounds of 6 or more.
+		"6:  cmp $6, %[rounds] \n\t"
+		"    jl  55f           \n\t"
+		"    " ROUND_3_INIT()
+		"    " ROUND_3_A_LAST(0)
+		"    sub $6,        %[rounds] \n\t"
+		"    add $(12 * 6), %[src]    \n\t"
+		"    add $(16 * 6), %[dst]    \n\t"
+
+		// Dispatch the remaining rounds 0..5.
+		"55: cmp $3, %[rounds] \n\t"
+		"    jg  45f           \n\t"
+		"    je  3f            \n\t"
+		"    cmp $1, %[rounds] \n\t"
+		"    jg  2f            \n\t"
+		"    je  1f            \n\t"
+		"    jmp 0f            \n\t"
+
+		"45: cmp $4, %[rounds] \n\t"
+		"    je  4f            \n\t"
+
+		// Block of non-interlaced encoding rounds, which can each
+		// individually be jumped to. Rounds fall through to the next.
+		"5: " ROUND()
+		"4: " ROUND()
+		"3: " ROUND()
+		"2: " ROUND()
+		"1: " ROUND()
+		"0: \n\t"
+
+		// Outputs (modified).
+		: [rounds] "+r"  (rounds),
+		  [loops]  "+r"  (loops),
+		  [src]    "+r"  (*s),
+		  [dst]    "+r"  (*o),
+		  [a]      "=&x" (a),
+		  [b]      "=&x" (b),
+		  [c]      "=&x" (c),
+		  [d]      "=&x" (d),
+		  [e]      "=&x" (e),
+		  [f]      "=&x" (f)
+
+		// Inputs (not modified).
+		: [lut0] "x" (lut0),
+		  [lut1] "x" (lut1),
+		  [msk0] "x" (_mm_set1_epi32(0x0FC0FC00)),
+		  [msk1] "x" (_mm_set1_epi32(0x04000040)),
+		  [msk2] "x" (_mm_set1_epi32(0x003F03F0)),
+		  [msk3] "x" (_mm_set1_epi32(0x01000010)),
+		  [n51]  "x" (_mm_set1_epi8(51)),
+		  [n25]  "x" (_mm_set1_epi8(25))
+
+		// Clobbers.
+		: "cc", "memory"
+	);
+}
+
+#pragma GCC diagnostic pop
diff --git a/deps/base64/base64/lib/arch/avx2/codec.c b/deps/base64/base64/lib/arch/avx2/codec.c
index 0498548b80d..8a2aa4a6071 100644
--- a/deps/base64/base64/lib/arch/avx2/codec.c
+++ b/deps/base64/base64/lib/arch/avx2/codec.c
@@ -11,11 +11,25 @@
 #if HAVE_AVX2
 #include <immintrin.h>
 
+// Only enable inline assembly on supported compilers and on 64-bit CPUs.
+#ifndef BASE64_AVX2_USE_ASM
+# if (defined(__GNUC__) || defined(__clang__)) && BASE64_WORDSIZE == 64
+#  define BASE64_AVX2_USE_ASM 1
+# else
+#  define BASE64_AVX2_USE_ASM 0
+# endif
+#endif
+
 #include "dec_reshuffle.c"
 #include "dec_loop.c"
-#include "enc_translate.c"
-#include "enc_reshuffle.c"
-#include "enc_loop.c"
+
+#if BASE64_AVX2_USE_ASM
+# include "enc_loop_asm.c"
+#else
+# include "enc_translate.c"
+# include "enc_reshuffle.c"
+# include "enc_loop.c"
+#endif
 
 #endif	// HAVE_AVX2
 
diff --git a/deps/base64/base64/lib/arch/avx2/enc_loop_asm.c b/deps/base64/base64/lib/arch/avx2/enc_loop_asm.c
new file mode 100644
index 00000000000..eb775a1d1f0
--- /dev/null
+++ b/deps/base64/base64/lib/arch/avx2/enc_loop_asm.c
@@ -0,0 +1,291 @@
+// Apologies in advance for combining the preprocessor with inline assembly,
+// two notoriously gnarly parts of C, but it was necessary to avoid a lot of
+// code repetition. The preprocessor is used to template large sections of
+// inline assembly that differ only in the registers used. If the code was
+// written out by hand, it would become very large and hard to audit.
+
+// Generate a block of inline assembly that loads register R0 from memory. The
+// offset at which the register is loaded is set by the given round and a
+// constant offset.
+#define LOAD(R0, ROUND, OFFSET) \
+	"vlddqu ("#ROUND" * 24 + "#OFFSET")(%[src]), %["R0"] \n\t"
+
+// Generate a block of inline assembly that deinterleaves and shuffles register
+// R0 using preloaded constants. Outputs in R0 and R1.
+#define SHUF(R0, R1, R2) \
+	"vpshufb  %[lut0], %["R0"], %["R1"] \n\t" \
+	"vpand    %["R1"], %[msk0], %["R2"] \n\t" \
+	"vpand    %["R1"], %[msk2], %["R1"] \n\t" \
+	"vpmulhuw %["R2"], %[msk1], %["R2"] \n\t" \
+	"vpmullw  %["R1"], %[msk3], %["R1"] \n\t" \
+	"vpor     %["R1"], %["R2"], %["R1"] \n\t"
+
+// Generate a block of inline assembly that takes R0 and R1 and translates
+// their contents to the base64 alphabet, using preloaded constants.
+#define TRAN(R0, R1, R2) \
+	"vpsubusb %[n51],  %["R1"], %["R0"] \n\t" \
+	"vpcmpgtb %[n25],  %["R1"], %["R2"] \n\t" \
+	"vpsubb   %["R2"], %["R0"], %["R0"] \n\t" \
+	"vpshufb  %["R0"], %[lut1], %["R2"] \n\t" \
+	"vpaddb   %["R1"], %["R2"], %["R0"] \n\t"
+
+// Generate a block of inline assembly that stores the given register R0 at an
+// offset set by the given round.
+#define STOR(R0, ROUND) \
+	"vmovdqu %["R0"], ("#ROUND" * 32)(%[dst]) \n\t"
+
+// Generate a block of inline assembly that generates a single self-contained
+// encoder round: fetch the data, process it, and store the result. Then update
+// the source and destination pointers.
+#define ROUND() \
+	LOAD("a", 0, -4) \
+	SHUF("a", "b", "c") \
+	TRAN("a", "b", "c") \
+	STOR("a", 0) \
+	"add $24, %[src] \n\t" \
+	"add $32, %[dst] \n\t"
+
+// Define a macro that initiates a three-way interleaved encoding round by
+// preloading registers a, b and c from memory.
+// The register graph shows which registers are in use during each step, and
+// is a visual aid for choosing registers for that step. Symbol index:
+//
+//  +  indicates that a register is loaded by that step.
+//  |  indicates that a register is in use and must not be touched.
+//  -  indicates that a register is decommissioned by that step.
+//  x  indicates that a register is used as a temporary by that step.
+//  V  indicates that a register is an input or output to the macro.
+//
+#define ROUND_3_INIT() 			/*  a b c d e f  */ \
+	LOAD("a",   0,  -4)		/*  +            */ \
+	SHUF("a", "d", "e")		/*  |     + x    */ \
+	LOAD("b",   1,  -4)		/*  | +   |      */ \
+	TRAN("a", "d", "e")		/*  | |   - x    */ \
+	LOAD("c",   2,  -4)		/*  V V V        */
+
+// Define a macro that translates, shuffles and stores the input registers A, B
+// and C, and preloads registers D, E and F for the next round.
+// This macro can be arbitrarily daisy-chained by feeding output registers D, E
+// and F back into the next round as input registers A, B and C. The macro
+// carefully interleaves memory operations with data operations for optimal
+// pipelined performance.
+
+#define ROUND_3(ROUND, A,B,C,D,E,F) 	/*  A B C D E F  */ \
+	LOAD(D, (ROUND + 3), -4)	/*  V V V +      */ \
+	SHUF(B, E, F)			/*  | | | | + x  */ \
+	STOR(A, (ROUND + 0))		/*  - | | | |    */ \
+	TRAN(B, E, F)			/*    | | | - x  */ \
+	LOAD(E, (ROUND + 4), -4)	/*    | | | +    */ \
+	SHUF(C, A, F)			/*  + | | | | x  */ \
+	STOR(B, (ROUND + 1))		/*  | - | | |    */ \
+	TRAN(C, A, F)			/*  -   | | | x  */ \
+	LOAD(F, (ROUND + 5), -4)	/*      | | | +  */ \
+	SHUF(D, A, B)			/*  + x | | | |  */ \
+	STOR(C, (ROUND + 2))		/*  |   - | | |  */ \
+	TRAN(D, A, B)			/*  - x   V V V  */
+
+// Define a macro that terminates a ROUND_3 macro by taking pre-loaded
+// registers D, E and F, and translating, shuffling and storing them.
+#define ROUND_3_END(ROUND, A,B,C,D,E,F)	/*  A B C D E F  */ \
+	SHUF(E, A, B)			/*  + x   V V V  */ \
+	STOR(D, (ROUND + 3))		/*  |     - | |  */ \
+	TRAN(E, A, B)			/*  - x     | |  */ \
+	SHUF(F, C, D)			/*      + x | |  */ \
+	STOR(E, (ROUND + 4))		/*      |   - |  */ \
+	TRAN(F, C, D)			/*      - x   |  */ \
+	STOR(F, (ROUND + 5))		/*            -  */
+
+// Define a type A round. Inputs are a, b, and c, outputs are d, e, and f.
+#define ROUND_3_A(ROUND) \
+	ROUND_3(ROUND, "a", "b", "c", "d", "e", "f")
+
+// Define a type B round. Inputs and outputs are swapped with regard to type A.
+#define ROUND_3_B(ROUND) \
+	ROUND_3(ROUND, "d", "e", "f", "a", "b", "c")
+
+// Terminating macro for a type A round.
+#define ROUND_3_A_LAST(ROUND) \
+	ROUND_3_A(ROUND) \
+	ROUND_3_END(ROUND, "a", "b", "c", "d", "e", "f")
+
+// Terminating macro for a type B round.
+#define ROUND_3_B_LAST(ROUND) \
+	ROUND_3_B(ROUND) \
+	ROUND_3_END(ROUND, "d", "e", "f", "a", "b", "c")
+
+// Suppress clang's warning that the literal string in the asm statement is
+// overlong (longer than the ISO-mandated minimum size of 4095 bytes for C99
+// compilers). It may be true, but the goal here is not C99 portability.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Woverlength-strings"
+
+static inline void
+enc_loop_avx2 (const uint8_t **s, size_t *slen, uint8_t **o, size_t *olen)
+{
+	// For a clearer explanation of the algorithm used by this function,
+	// please refer to the plain (not inline assembly) implementation. This
+	// function follows the same basic logic.
+
+	if (*slen < 32) {
+		return;
+	}
+
+	// Process blocks of 24 bytes at a time. Because blocks are loaded 32
+	// bytes at a time an offset of -4, ensure that there will be at least
+	// 4 remaining bytes after the last round, so that the final read will
+	// not pass beyond the bounds of the input buffer.
+	size_t rounds = (*slen - 4) / 24;
+
+	*slen -= rounds * 24;   // 24 bytes consumed per round
+	*olen += rounds * 32;   // 32 bytes produced per round
+
+	// Pre-decrement the number of rounds to get the number of rounds
+	// *after* the first round, which is handled as a special case.
+	rounds--;
+
+	// Number of times to go through the 36x loop.
+	size_t loops = rounds / 36;
+
+	// Number of rounds remaining after the 36x loop.
+	rounds %= 36;
+
+	// Lookup tables.
+	const __m256i lut0 = _mm256_set_epi8(
+		10, 11,  9, 10,  7,  8,  6,  7,  4,  5,  3,  4,  1,  2,  0,  1,
+		14, 15, 13, 14, 11, 12, 10, 11,  8,  9,  7,  8,  5,  6,  4,  5);
+
+	const __m256i lut1 = _mm256_setr_epi8(
+		65, 71, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -19, -16, 0, 0,
+		65, 71, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -19, -16, 0, 0);
+
+	// Temporary registers.
+	__m256i a, b, c, d, e;
+
+	// Temporary register f doubles as the shift mask for the first round.
+	__m256i f = _mm256_setr_epi32(0, 0, 1, 2, 3, 4, 5, 6);
+
+	__asm__ volatile (
+
+		// The first loop iteration requires special handling to ensure
+		// that the read, which is normally done at an offset of -4,
+		// does not underflow the buffer. Load the buffer at an offset
+		// of 0 and permute the input to achieve the same effect.
+		LOAD("a", 0, 0)
+		"vpermd %[a], %[f], %[a] \n\t"
+
+		// Perform the standard shuffling and translation steps.
+		SHUF("a", "b", "c")
+		TRAN("a", "b", "c")
+
+		// Store the result and increment the source and dest pointers.
+		"vmovdqu %[a], (%[dst]) \n\t"
+		"add     $24,  %[src]   \n\t"
+		"add     $32,  %[dst]   \n\t"
+
+		// If there are 36 rounds or more, enter a 36x unrolled loop of
+		// interleaved encoding rounds. The rounds interleave memory
+		// operations (load/store) with data operations (table lookups,
+		// etc) to maximize pipeline throughput.
+		"    test %[loops], %[loops] \n\t"
+		"    jz   18f                \n\t"
+		"    jmp  36f                \n\t"
+		"                            \n\t"
+		".balign 64                  \n\t"
+		"36: " ROUND_3_INIT()
+		"    " ROUND_3_A( 0)
+		"    " ROUND_3_B( 3)
+		"    " ROUND_3_A( 6)
+		"    " ROUND_3_B( 9)
+		"    " ROUND_3_A(12)
+		"    " ROUND_3_B(15)
+		"    " ROUND_3_A(18)
+		"    " ROUND_3_B(21)
+		"    " ROUND_3_A(24)
+		"    " ROUND_3_B(27)
+		"    " ROUND_3_A_LAST(30)
+		"    add $(24 * 36), %[src] \n\t"
+		"    add $(32 * 36), %[dst] \n\t"
+		"    dec %[loops]           \n\t"
+		"    jnz 36b                \n\t"
+
+		// Enter an 18x unrolled loop for rounds of 18 or more.
+		"18: cmp $18, %[rounds] \n\t"
+		"    jl  9f             \n\t"
+		"    " ROUND_3_INIT()
+		"    " ROUND_3_A(0)
+		"    " ROUND_3_B(3)
+		"    " ROUND_3_A(6)
+		"    " ROUND_3_B(9)
+		"    " ROUND_3_A_LAST(12)
+		"    sub $18,        %[rounds] \n\t"
+		"    add $(24 * 18), %[src]    \n\t"
+		"    add $(32 * 18), %[dst]    \n\t"
+
+		// Enter a 9x unrolled loop for rounds of 9 or more.
+		"9:  cmp $9, %[rounds] \n\t"
+		"    jl  6f            \n\t"
+		"    " ROUND_3_INIT()
+		"    " ROUND_3_A(0)
+		"    " ROUND_3_B_LAST(3)
+		"    sub $9,        %[rounds] \n\t"
+		"    add $(24 * 9), %[src]    \n\t"
+		"    add $(32 * 9), %[dst]    \n\t"
+
+		// Enter a 6x unrolled loop for rounds of 6 or more.
+		"6:  cmp $6, %[rounds] \n\t"
+		"    jl  55f           \n\t"
+		"    " ROUND_3_INIT()
+		"    " ROUND_3_A_LAST(0)
+		"    sub $6,        %[rounds] \n\t"
+		"    add $(24 * 6), %[src]    \n\t"
+		"    add $(32 * 6), %[dst]    \n\t"
+
+		// Dispatch the remaining rounds 0..5.
+		"55: cmp $3, %[rounds] \n\t"
+		"    jg  45f           \n\t"
+		"    je  3f            \n\t"
+		"    cmp $1, %[rounds] \n\t"
+		"    jg  2f            \n\t"
+		"    je  1f            \n\t"
+		"    jmp 0f            \n\t"
+
+		"45: cmp $4, %[rounds] \n\t"
+		"    je  4f            \n\t"
+
+		// Block of non-interlaced encoding rounds, which can each
+		// individually be jumped to. Rounds fall through to the next.
+		"5: " ROUND()
+		"4: " ROUND()
+		"3: " ROUND()
+		"2: " ROUND()
+		"1: " ROUND()
+		"0: \n\t"
+
+		// Outputs (modified).
+		: [rounds] "+r"  (rounds),
+		  [loops]  "+r"  (loops),
+		  [src]    "+r"  (*s),
+		  [dst]    "+r"  (*o),
+		  [a]      "=&x" (a),
+		  [b]      "=&x" (b),
+		  [c]      "=&x" (c),
+		  [d]      "=&x" (d),
+		  [e]      "=&x" (e),
+		  [f]      "+x"  (f)
+
+		// Inputs (not modified).
+		: [lut0] "x" (lut0),
+		  [lut1] "x" (lut1),
+		  [msk0] "x" (_mm256_set1_epi32(0x0FC0FC00)),
+		  [msk1] "x" (_mm256_set1_epi32(0x04000040)),
+		  [msk2] "x" (_mm256_set1_epi32(0x003F03F0)),
+		  [msk3] "x" (_mm256_set1_epi32(0x01000010)),
+		  [n51]  "x" (_mm256_set1_epi8(51)),
+		  [n25]  "x" (_mm256_set1_epi8(25))
+
+		// Clobbers.
+		: "cc", "memory"
+	);
+}
+
+#pragma GCC diagnostic pop
diff --git a/deps/base64/base64/lib/arch/avx512/codec.c b/deps/base64/base64/lib/arch/avx512/codec.c
new file mode 100644
index 00000000000..664120853d4
--- /dev/null
+++ b/deps/base64/base64/lib/arch/avx512/codec.c
@@ -0,0 +1,42 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+#include "../../../include/libbase64.h"
+#include "../../tables/tables.h"
+#include "../../codecs.h"
+#include "config.h"
+#include "../../env.h"
+
+#if HAVE_AVX512
+#include <immintrin.h>
+
+#include "../avx2/dec_reshuffle.c"
+#include "../avx2/dec_loop.c"
+#include "enc_reshuffle_translate.c"
+#include "enc_loop.c"
+
+#endif	// HAVE_AVX512
+
+BASE64_ENC_FUNCTION(avx512)
+{
+#if HAVE_AVX512
+	#include "../generic/enc_head.c"
+	enc_loop_avx512(&s, &slen, &o, &olen);
+	#include "../generic/enc_tail.c"
+#else
+	BASE64_ENC_STUB
+#endif
+}
+
+// Reuse AVX2 decoding. Not supporting AVX512 at present
+BASE64_DEC_FUNCTION(avx512)
+{
+#if HAVE_AVX512
+	#include "../generic/dec_head.c"
+	dec_loop_avx2(&s, &slen, &o, &olen);
+	#include "../generic/dec_tail.c"
+#else
+	BASE64_DEC_STUB
+#endif
+}
diff --git a/deps/base64/base64/lib/arch/avx512/enc_loop.c b/deps/base64/base64/lib/arch/avx512/enc_loop.c
new file mode 100644
index 00000000000..4c71e160ae8
--- /dev/null
+++ b/deps/base64/base64/lib/arch/avx512/enc_loop.c
@@ -0,0 +1,61 @@
+static inline void
+enc_loop_avx512_inner (const uint8_t **s, uint8_t **o)
+{
+	// Load input.
+	__m512i src = _mm512_loadu_si512((__m512i *) *s);
+
+	// Reshuffle, translate, store.
+	src = enc_reshuffle_translate(src);
+	_mm512_storeu_si512((__m512i *) *o, src);
+
+	*s += 48;
+	*o += 64;
+}
+
+static inline void
+enc_loop_avx512 (const uint8_t **s, size_t *slen, uint8_t **o, size_t *olen)
+{
+	if (*slen < 64) {
+		return;
+	}
+
+	// Process blocks of 48 bytes at a time. Because blocks are loaded 64
+	// bytes at a time, ensure that there will be at least 24 remaining
+	// bytes after the last round, so that the final read will not pass
+	// beyond the bounds of the input buffer.
+	size_t rounds = (*slen - 24) / 48;
+
+	*slen -= rounds * 48;   // 48 bytes consumed per round
+	*olen += rounds * 64;   // 64 bytes produced per round
+
+	while (rounds > 0) {
+		if (rounds >= 8) {
+			enc_loop_avx512_inner(s, o);
+			enc_loop_avx512_inner(s, o);
+			enc_loop_avx512_inner(s, o);
+			enc_loop_avx512_inner(s, o);
+			enc_loop_avx512_inner(s, o);
+			enc_loop_avx512_inner(s, o);
+			enc_loop_avx512_inner(s, o);
+			enc_loop_avx512_inner(s, o);
+			rounds -= 8;
+			continue;
+		}
+		if (rounds >= 4) {
+			enc_loop_avx512_inner(s, o);
+			enc_loop_avx512_inner(s, o);
+			enc_loop_avx512_inner(s, o);
+			enc_loop_avx512_inner(s, o);
+			rounds -= 4;
+			continue;
+		}
+		if (rounds >= 2) {
+			enc_loop_avx512_inner(s, o);
+			enc_loop_avx512_inner(s, o);
+			rounds -= 2;
+			continue;
+		}
+		enc_loop_avx512_inner(s, o);
+		break;
+	}
+}
diff --git a/deps/base64/base64/lib/arch/avx512/enc_reshuffle_translate.c b/deps/base64/base64/lib/arch/avx512/enc_reshuffle_translate.c
new file mode 100644
index 00000000000..5c332bb24ca
--- /dev/null
+++ b/deps/base64/base64/lib/arch/avx512/enc_reshuffle_translate.c
@@ -0,0 +1,50 @@
+// AVX512 algorithm is based on permutevar and multishift. The code is based on
+// https://github.com/WojciechMula/base64simd which is under BSD-2 license.
+
+static inline __m512i
+enc_reshuffle_translate (const __m512i input)
+{
+	// 32-bit input
+	// [ 0  0  0  0  0  0  0  0|c1 c0 d5 d4 d3 d2 d1 d0|
+	//  b3 b2 b1 b0 c5 c4 c3 c2|a5 a4 a3 a2 a1 a0 b5 b4]
+	// output order  [1, 2, 0, 1]
+	// [b3 b2 b1 b0 c5 c4 c3 c2|c1 c0 d5 d4 d3 d2 d1 d0|
+	//  a5 a4 a3 a2 a1 a0 b5 b4|b3 b2 b1 b0 c3 c2 c1 c0]
+
+	const __m512i shuffle_input = _mm512_setr_epi32(0x01020001,
+	                                                0x04050304,
+	                                                0x07080607,
+	                                                0x0a0b090a,
+	                                                0x0d0e0c0d,
+	                                                0x10110f10,
+	                                                0x13141213,
+	                                                0x16171516,
+	                                                0x191a1819,
+	                                                0x1c1d1b1c,
+	                                                0x1f201e1f,
+	                                                0x22232122,
+	                                                0x25262425,
+	                                                0x28292728,
+	                                                0x2b2c2a2b,
+	                                                0x2e2f2d2e);
+
+	// Reorder bytes
+	// [b3 b2 b1 b0 c5 c4 c3 c2|c1 c0 d5 d4 d3 d2 d1 d0|
+	//  a5 a4 a3 a2 a1 a0 b5 b4|b3 b2 b1 b0 c3 c2 c1 c0]
+	const __m512i in = _mm512_permutexvar_epi8(shuffle_input, input);
+
+	// After multishift a single 32-bit lane has following layout
+	// [c1 c0 d5 d4 d3 d2 d1 d0|b1 b0 c5 c4 c3 c2 c1 c0|
+	//  a1 a0 b5 b4 b3 b2 b1 b0|d1 d0 a5 a4 a3 a2 a1 a0]
+	// (a = [10:17], b = [4:11], c = [22:27], d = [16:21])
+
+	// 48, 54, 36, 42, 16, 22, 4, 10
+	const __m512i shifts = _mm512_set1_epi64(0x3036242a1016040alu);
+	__m512i shuffled_in = _mm512_multishift_epi64_epi8(shifts, in);
+
+	// Translate immediatedly after reshuffled.
+	const __m512i lookup = _mm512_loadu_si512(base64_table_enc_6bit);
+
+	// Translation 6-bit values to ASCII.
+	return _mm512_permutexvar_epi8(shuffled_in, lookup);
+}
diff --git a/deps/base64/base64/lib/arch/neon32/enc_loop.c b/deps/base64/base64/lib/arch/neon32/enc_loop.c
index e9e8e285256..d694b33733c 100644
--- a/deps/base64/base64/lib/arch/neon32/enc_loop.c
+++ b/deps/base64/base64/lib/arch/neon32/enc_loop.c
@@ -100,7 +100,8 @@ enc_loop_neon32_inner_asm (const uint8_t **s, uint8_t **o)
 		  [n63] "w" (n63)
 
 		// Clobbers.
-		: "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31"
+		: "d24", "d25", "d26", "d27", "d28", "d29", "d30", "d31",
+		  "cc", "memory"
 	);
 }
 #endif
diff --git a/deps/base64/base64/lib/arch/neon64/enc_loop_asm.c b/deps/base64/base64/lib/arch/neon64/enc_loop_asm.c
index cf2fd27e80d..182e9cdf4a1 100644
--- a/deps/base64/base64/lib/arch/neon64/enc_loop_asm.c
+++ b/deps/base64/base64/lib/arch/neon64/enc_loop_asm.c
@@ -160,7 +160,8 @@ enc_loop_neon64 (const uint8_t **s, size_t *slen, uint8_t **o, size_t *olen)
 		// Clobbers.
 		: "v2",  "v3",  "v4",  "v5",
 		  "v8",  "v9",  "v10", "v11",
-		  "v12", "v13", "v14", "v15"
+		  "v12", "v13", "v14", "v15",
+		  "cc", "memory"
 	);
 }
 
diff --git a/deps/base64/base64/lib/arch/sse41/codec.c b/deps/base64/base64/lib/arch/sse41/codec.c
index 00645feda83..6e5afe30011 100644
--- a/deps/base64/base64/lib/arch/sse41/codec.c
+++ b/deps/base64/base64/lib/arch/sse41/codec.c
@@ -11,11 +11,25 @@
 #if HAVE_SSE41
 #include <smmintrin.h>
 
+// Only enable inline assembly on supported compilers and on 64-bit CPUs.
+#ifndef BASE64_SSE41_USE_ASM
+# if (defined(__GNUC__) || defined(__clang__)) && BASE64_WORDSIZE == 64
+#  define BASE64_SSE41_USE_ASM 1
+# else
+#  define BASE64_SSE41_USE_ASM 0
+# endif
+#endif
+
 #include "../ssse3/dec_reshuffle.c"
 #include "../ssse3/dec_loop.c"
-#include "../ssse3/enc_translate.c"
-#include "../ssse3/enc_reshuffle.c"
-#include "../ssse3/enc_loop.c"
+
+#if BASE64_SSE41_USE_ASM
+# include "../ssse3/enc_loop_asm.c"
+#else
+# include "../ssse3/enc_translate.c"
+# include "../ssse3/enc_reshuffle.c"
+# include "../ssse3/enc_loop.c"
+#endif
 
 #endif	// HAVE_SSE41
 
diff --git a/deps/base64/base64/lib/arch/sse42/codec.c b/deps/base64/base64/lib/arch/sse42/codec.c
index cf5d97cfb29..dde823b7aa0 100644
--- a/deps/base64/base64/lib/arch/sse42/codec.c
+++ b/deps/base64/base64/lib/arch/sse42/codec.c
@@ -11,11 +11,25 @@
 #if HAVE_SSE42
 #include <nmmintrin.h>
 
+// Only enable inline assembly on supported compilers and on 64-bit CPUs.
+#ifndef BASE64_SSE42_USE_ASM
+# if (defined(__GNUC__) || defined(__clang__)) && BASE64_WORDSIZE == 64
+#  define BASE64_SSE42_USE_ASM 1
+# else
+#  define BASE64_SSE42_USE_ASM 0
+# endif
+#endif
+
 #include "../ssse3/dec_reshuffle.c"
 #include "../ssse3/dec_loop.c"
-#include "../ssse3/enc_translate.c"
-#include "../ssse3/enc_reshuffle.c"
-#include "../ssse3/enc_loop.c"
+
+#if BASE64_SSE42_USE_ASM
+# include "../ssse3/enc_loop_asm.c"
+#else
+# include "../ssse3/enc_translate.c"
+# include "../ssse3/enc_reshuffle.c"
+# include "../ssse3/enc_loop.c"
+#endif
 
 #endif	// HAVE_SSE42
 
diff --git a/deps/base64/base64/lib/arch/ssse3/codec.c b/deps/base64/base64/lib/arch/ssse3/codec.c
index ad14a4589de..a812a2901f4 100644
--- a/deps/base64/base64/lib/arch/ssse3/codec.c
+++ b/deps/base64/base64/lib/arch/ssse3/codec.c
@@ -11,11 +11,27 @@
 #if HAVE_SSSE3
 #include <tmmintrin.h>
 
+// Only enable inline assembly on supported compilers and on 64-bit CPUs.
+// 32-bit CPUs with SSSE3 support, such as low-end Atoms, only have eight XMM
+// registers, which is not enough to run the inline assembly.
+#ifndef BASE64_SSSE3_USE_ASM
+# if (defined(__GNUC__) || defined(__clang__)) && BASE64_WORDSIZE == 64
+#  define BASE64_SSSE3_USE_ASM 1
+# else
+#  define BASE64_SSSE3_USE_ASM 0
+# endif
+#endif
+
 #include "dec_reshuffle.c"
 #include "dec_loop.c"
-#include "enc_reshuffle.c"
-#include "enc_translate.c"
-#include "enc_loop.c"
+
+#if BASE64_SSSE3_USE_ASM
+# include "enc_loop_asm.c"
+#else
+# include "enc_reshuffle.c"
+# include "enc_translate.c"
+# include "enc_loop.c"
+#endif
 
 #endif	// HAVE_SSSE3
 
diff --git a/deps/base64/base64/lib/arch/ssse3/enc_loop_asm.c b/deps/base64/base64/lib/arch/ssse3/enc_loop_asm.c
new file mode 100644
index 00000000000..0cdb340a63b
--- /dev/null
+++ b/deps/base64/base64/lib/arch/ssse3/enc_loop_asm.c
@@ -0,0 +1,268 @@
+// Apologies in advance for combining the preprocessor with inline assembly,
+// two notoriously gnarly parts of C, but it was necessary to avoid a lot of
+// code repetition. The preprocessor is used to template large sections of
+// inline assembly that differ only in the registers used. If the code was
+// written out by hand, it would become very large and hard to audit.
+
+// Generate a block of inline assembly that loads register R0 from memory. The
+// offset at which the register is loaded is set by the given round.
+#define LOAD(R0, ROUND) \
+	"lddqu ("#ROUND" * 12)(%[src]), %["R0"] \n\t"
+
+// Generate a block of inline assembly that deinterleaves and shuffles register
+// R0 using preloaded constants. Outputs in R0 and R1.
+#define SHUF(R0, R1) \
+	"pshufb  %[lut0], %["R0"] \n\t" \
+	"movdqa  %["R0"], %["R1"] \n\t" \
+	"pand    %[msk0], %["R0"] \n\t" \
+	"pand    %[msk2], %["R1"] \n\t" \
+	"pmulhuw %[msk1], %["R0"] \n\t" \
+	"pmullw  %[msk3], %["R1"] \n\t" \
+	"por     %["R1"], %["R0"] \n\t"
+
+// Generate a block of inline assembly that takes R0 and R1 and translates
+// their contents to the base64 alphabet, using preloaded constants.
+#define TRAN(R0, R1, R2) \
+	"movdqa  %["R0"], %["R1"] \n\t" \
+	"movdqa  %["R0"], %["R2"] \n\t" \
+	"psubusb %[n51],  %["R1"] \n\t" \
+	"pcmpgtb %[n25],  %["R2"] \n\t" \
+	"psubb   %["R2"], %["R1"] \n\t" \
+	"movdqa  %[lut1], %["R2"] \n\t" \
+	"pshufb  %["R1"], %["R2"] \n\t" \
+	"paddb   %["R2"], %["R0"] \n\t"
+
+// Generate a block of inline assembly that stores the given register R0 at an
+// offset set by the given round.
+#define STOR(R0, ROUND) \
+	"movdqu %["R0"], ("#ROUND" * 16)(%[dst]) \n\t"
+
+// Generate a block of inline assembly that generates a single self-contained
+// encoder round: fetch the data, process it, and store the result. Then update
+// the source and destination pointers.
+#define ROUND() \
+	LOAD("a", 0) \
+	SHUF("a", "b") \
+	TRAN("a", "b", "c") \
+	STOR("a", 0) \
+	"add $12, %[src] \n\t" \
+	"add $16, %[dst] \n\t"
+
+// Define a macro that initiates a three-way interleaved encoding round by
+// preloading registers a, b and c from memory.
+// The register graph shows which registers are in use during each step, and
+// is a visual aid for choosing registers for that step. Symbol index:
+//
+//  +  indicates that a register is loaded by that step.
+//  |  indicates that a register is in use and must not be touched.
+//  -  indicates that a register is decommissioned by that step.
+//  x  indicates that a register is used as a temporary by that step.
+//  V  indicates that a register is an input or output to the macro.
+//
+#define ROUND_3_INIT() 			/*  a b c d e f  */ \
+	LOAD("a", 0)			/*  +            */ \
+	SHUF("a", "d")			/*  |     +      */ \
+	LOAD("b", 1)			/*  | +   |      */ \
+	TRAN("a", "d", "e")		/*  | |   - x    */ \
+	LOAD("c", 2)			/*  V V V        */
+
+// Define a macro that translates, shuffles and stores the input registers A, B
+// and C, and preloads registers D, E and F for the next round.
+// This macro can be arbitrarily daisy-chained by feeding output registers D, E
+// and F back into the next round as input registers A, B and C. The macro
+// carefully interleaves memory operations with data operations for optimal
+// pipelined performance.
+
+#define ROUND_3(ROUND, A,B,C,D,E,F) 	/*  A B C D E F  */ \
+	LOAD(D, (ROUND + 3))		/*  V V V +      */ \
+	SHUF(B, E)			/*  | | | | +    */ \
+	STOR(A, (ROUND + 0))		/*  - | | | |    */ \
+	TRAN(B, E, F)			/*    | | | - x  */ \
+	LOAD(E, (ROUND + 4))		/*    | | | +    */ \
+	SHUF(C, A)			/*  + | | | |    */ \
+	STOR(B, (ROUND + 1))		/*  | - | | |    */ \
+	TRAN(C, A, F)			/*  -   | | | x  */ \
+	LOAD(F, (ROUND + 5))		/*      | | | +  */ \
+	SHUF(D, A)			/*  +   | | | |  */ \
+	STOR(C, (ROUND + 2))		/*  |   - | | |  */ \
+	TRAN(D, A, B)			/*  - x   V V V  */
+
+// Define a macro that terminates a ROUND_3 macro by taking pre-loaded
+// registers D, E and F, and translating, shuffling and storing them.
+#define ROUND_3_END(ROUND, A,B,C,D,E,F)	/*  A B C D E F  */ \
+	SHUF(E, A)			/*  +     V V V  */ \
+	STOR(D, (ROUND + 3))		/*  |     - | |  */ \
+	TRAN(E, A, B)			/*  - x     | |  */ \
+	SHUF(F, C)			/*      +   | |  */ \
+	STOR(E, (ROUND + 4))		/*      |   - |  */ \
+	TRAN(F, C, D)			/*      - x   |  */ \
+	STOR(F, (ROUND + 5))		/*            -  */
+
+// Define a type A round. Inputs are a, b, and c, outputs are d, e, and f.
+#define ROUND_3_A(ROUND) \
+	ROUND_3(ROUND, "a", "b", "c", "d", "e", "f")
+
+// Define a type B round. Inputs and outputs are swapped with regard to type A.
+#define ROUND_3_B(ROUND) \
+	ROUND_3(ROUND, "d", "e", "f", "a", "b", "c")
+
+// Terminating macro for a type A round.
+#define ROUND_3_A_LAST(ROUND) \
+	ROUND_3_A(ROUND) \
+	ROUND_3_END(ROUND, "a", "b", "c", "d", "e", "f")
+
+// Terminating macro for a type B round.
+#define ROUND_3_B_LAST(ROUND) \
+	ROUND_3_B(ROUND) \
+	ROUND_3_END(ROUND, "d", "e", "f", "a", "b", "c")
+
+// Suppress clang's warning that the literal string in the asm statement is
+// overlong (longer than the ISO-mandated minimum size of 4095 bytes for C99
+// compilers). It may be true, but the goal here is not C99 portability.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Woverlength-strings"
+
+static inline void
+enc_loop_ssse3 (const uint8_t **s, size_t *slen, uint8_t **o, size_t *olen)
+{
+	// For a clearer explanation of the algorithm used by this function,
+	// please refer to the plain (not inline assembly) implementation. This
+	// function follows the same basic logic.
+
+	if (*slen < 16) {
+		return;
+	}
+
+	// Process blocks of 12 bytes at a time. Input is read in blocks of 16
+	// bytes, so "reserve" four bytes from the input buffer to ensure that
+	// we never read beyond the end of the input buffer.
+	size_t rounds = (*slen - 4) / 12;
+
+	*slen -= rounds * 12;   // 12 bytes consumed per round
+	*olen += rounds * 16;   // 16 bytes produced per round
+
+	// Number of times to go through the 36x loop.
+	size_t loops = rounds / 36;
+
+	// Number of rounds remaining after the 36x loop.
+	rounds %= 36;
+
+	// Lookup tables.
+	const __m128i lut0 = _mm_set_epi8(
+		10, 11,  9, 10,  7,  8,  6,  7,  4,  5,  3,  4,  1,  2,  0,  1);
+
+	const __m128i lut1 = _mm_setr_epi8(
+		65, 71, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -19, -16, 0, 0);
+
+	// Temporary registers.
+	__m128i a, b, c, d, e, f;
+
+	__asm__ volatile (
+
+		// If there are 36 rounds or more, enter a 36x unrolled loop of
+		// interleaved encoding rounds. The rounds interleave memory
+		// operations (load/store) with data operations (table lookups,
+		// etc) to maximize pipeline throughput.
+		"    test %[loops], %[loops] \n\t"
+		"    jz   18f                \n\t"
+		"    jmp  36f                \n\t"
+		"                            \n\t"
+		".balign 64                  \n\t"
+		"36: " ROUND_3_INIT()
+		"    " ROUND_3_A( 0)
+		"    " ROUND_3_B( 3)
+		"    " ROUND_3_A( 6)
+		"    " ROUND_3_B( 9)
+		"    " ROUND_3_A(12)
+		"    " ROUND_3_B(15)
+		"    " ROUND_3_A(18)
+		"    " ROUND_3_B(21)
+		"    " ROUND_3_A(24)
+		"    " ROUND_3_B(27)
+		"    " ROUND_3_A_LAST(30)
+		"    add $(12 * 36), %[src] \n\t"
+		"    add $(16 * 36), %[dst] \n\t"
+		"    dec %[loops]           \n\t"
+		"    jnz 36b                \n\t"
+
+		// Enter an 18x unrolled loop for rounds of 18 or more.
+		"18: cmp $18, %[rounds] \n\t"
+		"    jl  9f             \n\t"
+		"    " ROUND_3_INIT()
+		"    " ROUND_3_A(0)
+		"    " ROUND_3_B(3)
+		"    " ROUND_3_A(6)
+		"    " ROUND_3_B(9)
+		"    " ROUND_3_A_LAST(12)
+		"    sub $18,        %[rounds] \n\t"
+		"    add $(12 * 18), %[src]    \n\t"
+		"    add $(16 * 18), %[dst]    \n\t"
+
+		// Enter a 9x unrolled loop for rounds of 9 or more.
+		"9:  cmp $9, %[rounds] \n\t"
+		"    jl  6f            \n\t"
+		"    " ROUND_3_INIT()
+		"    " ROUND_3_A(0)
+		"    " ROUND_3_B_LAST(3)
+		"    sub $9,        %[rounds] \n\t"
+		"    add $(12 * 9), %[src]    \n\t"
+		"    add $(16 * 9), %[dst]    \n\t"
+
+		// Enter a 6x unrolled loop for rounds of 6 or more.
+		"6:  cmp $6, %[rounds] \n\t"
+		"    jl  55f           \n\t"
+		"    " ROUND_3_INIT()
+		"    " ROUND_3_A_LAST(0)
+		"    sub $6,        %[rounds] \n\t"
+		"    add $(12 * 6), %[src]    \n\t"
+		"    add $(16 * 6), %[dst]    \n\t"
+
+		// Dispatch the remaining rounds 0..5.
+		"55: cmp $3, %[rounds] \n\t"
+		"    jg  45f           \n\t"
+		"    je  3f            \n\t"
+		"    cmp $1, %[rounds] \n\t"
+		"    jg  2f            \n\t"
+		"    je  1f            \n\t"
+		"    jmp 0f            \n\t"
+
+		"45: cmp $4, %[rounds] \n\t"
+		"    je  4f            \n\t"
+
+		// Block of non-interlaced encoding rounds, which can each
+		// individually be jumped to. Rounds fall through to the next.
+		"5: " ROUND()
+		"4: " ROUND()
+		"3: " ROUND()
+		"2: " ROUND()
+		"1: " ROUND()
+		"0: \n\t"
+
+		// Outputs (modified).
+		: [rounds] "+r"  (rounds),
+		  [loops]  "+r"  (loops),
+		  [src]    "+r"  (*s),
+		  [dst]    "+r"  (*o),
+		  [a]      "=&x" (a),
+		  [b]      "=&x" (b),
+		  [c]      "=&x" (c),
+		  [d]      "=&x" (d),
+		  [e]      "=&x" (e),
+		  [f]      "=&x" (f)
+
+		// Inputs (not modified).
+		: [lut0] "x" (lut0),
+		  [lut1] "x" (lut1),
+		  [msk0] "x" (_mm_set1_epi32(0x0FC0FC00)),
+		  [msk1] "x" (_mm_set1_epi32(0x04000040)),
+		  [msk2] "x" (_mm_set1_epi32(0x003F03F0)),
+		  [msk3] "x" (_mm_set1_epi32(0x01000010)),
+		  [n51]  "x" (_mm_set1_epi8(51)),
+		  [n25]  "x" (_mm_set1_epi8(25))
+
+		// Clobbers.
+		: "cc", "memory"
+	);
+}
+
+#pragma GCC diagnostic pop
diff --git a/deps/base64/base64/lib/codec_choose.c b/deps/base64/base64/lib/codec_choose.c
index 6a07d6a74cc..abef3f2ae9f 100644
--- a/deps/base64/base64/lib/codec_choose.c
+++ b/deps/base64/base64/lib/codec_choose.c
@@ -2,6 +2,7 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <stdio.h>
 
 #include "../include/libbase64.h"
 #include "codecs.h"
@@ -10,7 +11,7 @@
 
 #if (__x86_64__ || __i386__ || _M_X86 || _M_X64)
   #define BASE64_X86
-  #if (HAVE_SSSE3 || HAVE_SSE41 || HAVE_SSE42 || HAVE_AVX || HAVE_AVX2)
+  #if (HAVE_SSSE3 || HAVE_SSE41 || HAVE_SSE42 || HAVE_AVX || HAVE_AVX2 || HAVE_AVX512)
     #define BASE64_X86_SIMD
   #endif
 #endif
@@ -31,7 +32,7 @@
 		__cpuid_count(__level, 0, __eax, __ebx, __ecx, __edx)
 #else
 	#include <cpuid.h>
-	#if HAVE_AVX2 || HAVE_AVX
+	#if HAVE_AVX512 || HAVE_AVX2 || HAVE_AVX
 		#if ((__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ >= 2) || (__clang_major__ >= 3))
 			static inline uint64_t _xgetbv (uint32_t index)
 			{
@@ -45,6 +46,12 @@
 	#endif
 #endif
 
+#ifndef bit_AVX512vl
+#define bit_AVX512vl (1 << 31)
+#endif
+#ifndef bit_AVX512vbmi
+#define bit_AVX512vbmi (1 << 1)
+#endif
 #ifndef bit_AVX2
 #define bit_AVX2 (1 << 5)
 #endif
@@ -75,6 +82,7 @@
 	BASE64_ENC_FUNCTION(arch);	\
 	BASE64_DEC_FUNCTION(arch);	\
 
+BASE64_CODEC_FUNCS(avx512)
 BASE64_CODEC_FUNCS(avx2)
 BASE64_CODEC_FUNCS(neon32)
 BASE64_CODEC_FUNCS(neon64)
@@ -91,9 +99,10 @@ codec_choose_forced (struct codec *codec, int flags)
 	// always allow it, even if the codec is a no-op.
 	// For testing purposes.
 
-	if (!(flags & 0xFF)) {
+	if (!(flags & 0xFFFF)) {
 		return false;
 	}
+
 	if (flags & BASE64_FORCE_AVX2) {
 		codec->enc = base64_stream_encode_avx2;
 		codec->dec = base64_stream_decode_avx2;
@@ -134,6 +143,11 @@ codec_choose_forced (struct codec *codec, int flags)
 		codec->dec = base64_stream_decode_avx;
 		return true;
 	}
+	if (flags & BASE64_FORCE_AVX512) {
+		codec->enc = base64_stream_encode_avx512;
+		codec->dec = base64_stream_decode_avx512;
+		return true;
+	}
 	return false;
 }
 
@@ -178,8 +192,8 @@ codec_choose_x86 (struct codec *codec)
 	max_level = __get_cpuid_max(0, NULL);
 	#endif
 
-	#if HAVE_AVX2 || HAVE_AVX
-	// Check for AVX/AVX2 support:
+	#if HAVE_AVX512 || HAVE_AVX2 || HAVE_AVX
+	// Check for AVX/AVX2/AVX512 support:
 	// Checking for AVX requires 3 things:
 	// 1) CPUID indicates that the OS uses XSAVE and XRSTORE instructions
 	//    (allowing saving YMM registers on context switch)
@@ -194,7 +208,17 @@ codec_choose_x86 (struct codec *codec)
 		if (ecx & bit_XSAVE_XRSTORE) {
 			uint64_t xcr_mask;
 			xcr_mask = _xgetbv(_XCR_XFEATURE_ENABLED_MASK);
-			if (xcr_mask & _XCR_XMM_AND_YMM_STATE_ENABLED_BY_OS) {
+			if ((xcr_mask & _XCR_XMM_AND_YMM_STATE_ENABLED_BY_OS) == _XCR_XMM_AND_YMM_STATE_ENABLED_BY_OS) { // check multiple bits at once
+				#if HAVE_AVX512
+				if (max_level >= 7) {
+					__cpuid_count(7, 0, eax, ebx, ecx, edx);
+					if ((ebx & bit_AVX512vl) && (ecx & bit_AVX512vbmi)) {
+						codec->enc = base64_stream_encode_avx512;
+						codec->dec = base64_stream_decode_avx512;
+						return true;
+					}
+				}
+				#endif
 				#if HAVE_AVX2
 				if (max_level >= 7) {
 					__cpuid_count(7, 0, eax, ebx, ecx, edx);
diff --git a/deps/base64/base64/lib/lib.c b/deps/base64/base64/lib/lib.c
index 4703512b87a..053931a9918 100644
--- a/deps/base64/base64/lib/lib.c
+++ b/deps/base64/base64/lib/lib.c
@@ -68,7 +68,7 @@ void
 base64_stream_decode_init (struct base64_state *state, int flags)
 {
 	// If any of the codec flags are set, redo choice:
-	if (codec.dec == NULL || flags & 0xFF) {
+	if (codec.dec == NULL || flags & 0xFFFF) {
 		codec_choose(&codec, flags);
 	}
 	state->eof = 0;
diff --git a/deps/base64/base64/test/Makefile b/deps/base64/base64/test/Makefile
index d1045824195..c896627e0bd 100644
--- a/deps/base64/base64/test/Makefile
+++ b/deps/base64/base64/test/Makefile
@@ -11,12 +11,15 @@ else
   BENCH_LDFLAGS=-lrt
 endif
 
-.PHONY: clean test
+.PHONY: clean test valgrind
 
 test: clean test_base64 benchmark
 	./test_base64
 	./benchmark
 
+valgrind: clean test_base64
+	valgrind --error-exitcode=2 ./test_base64
+
 test_base64: test_base64.c codec_supported.o ../lib/libbase64.o
 	$(CC) $(CFLAGS) -o $@ $^
 
diff --git a/deps/base64/base64/test/ci/analysis.sh b/deps/base64/base64/test/ci/analysis.sh
new file mode 100755
index 00000000000..f7da1857fe0
--- /dev/null
+++ b/deps/base64/base64/test/ci/analysis.sh
@@ -0,0 +1,37 @@
+#!/bin/bash
+set -ve
+
+MACHINE=$(uname -m)
+export CC=gcc
+
+uname -a
+clang --version  # make analyse
+${CC} --version  # make -C test valgrind
+
+for USE_ASSEMBLY in 0 1; do
+	if [ "${MACHINE}" == "x86_64" ]; then
+		export SSSE3_CFLAGS="-mssse3 -DBASE64_SSSE3_USE_ASM=${USE_ASSEMBLY}"
+		export SSE41_CFLAGS="-msse4.1 -DBASE64_SSE41_USE_ASM=${USE_ASSEMBLY}"
+		export SSE42_CFLAGS="-msse4.2 -DBASE64_SSE42_USE_ASM=${USE_ASSEMBLY}"
+		export AVX_CFLAGS="-mavx -DBASE64_AVX_USE_ASM=${USE_ASSEMBLY}"
+		export AVX2_CFLAGS="-mavx2 -DBASE64_AVX2_USE_ASM=${USE_ASSEMBLY}"
+		# Temporarily disable AVX512; it is not available in CI yet.
+		# export AVX512_CFLAGS="-mavx512vl -mavx512vbmi"
+	elif [ "${MACHINE}" == "aarch64" ]; then
+		export NEON64_CFLAGS="-march=armv8-a"
+	elif [ "${MACHINE}" == "armv7l" ]; then
+		export NEON32_CFLAGS="-march=armv7-a -mfloat-abi=hard -mfpu=neon"
+	fi
+
+	if [ ${USE_ASSEMBLY} -eq 0 ]; then
+		echo "::group::analyze"
+		make analyze
+		echo "::endgroup::"
+	fi
+
+	echo "::group::valgrind (USE_ASSEMBLY=${USE_ASSEMBLY})"
+	make clean
+	make
+	make -C test valgrind
+	echo "::endgroup::"
+done
diff --git a/deps/base64/base64/test/ci/test.sh b/deps/base64/base64/test/ci/test.sh
index 066a49f400b..fb188418cca 100755
--- a/deps/base64/base64/test/ci/test.sh
+++ b/deps/base64/base64/test/ci/test.sh
@@ -7,9 +7,11 @@ if [ "${MACHINE}" == "x86_64" ]; then
 	export SSE41_CFLAGS=-msse4.1
 	export SSE42_CFLAGS=-msse4.2
 	export AVX_CFLAGS=-mavx
-	# no AVX2 on GHA macOS
+	# no AVX2 or AVX512 on GHA macOS
 	if [ "$(uname -s)" != "Darwin" ]; then
 		export AVX2_CFLAGS=-mavx2
+		# Temporarily disable AVX512; it is not available in CI yet.
+		# export AVX512_CFLAGS="-mavx512vl -mavx512vbmi"
 	fi
 elif [ "${MACHINE}" == "aarch64" ]; then
 	export NEON64_CFLAGS="-march=armv8-a"
diff --git a/deps/base64/base64/test/codec_supported.c b/deps/base64/base64/test/codec_supported.c
index a027b9943bf..f68c766875a 100644
--- a/deps/base64/base64/test/codec_supported.c
+++ b/deps/base64/base64/test/codec_supported.c
@@ -11,6 +11,7 @@ static char *_codecs[] =
 , "SSE41"
 , "SSE42"
 , "AVX"
+, "AVX512"
 , NULL
 } ;
 
diff --git a/deps/base64/base64/test/test_base64.c b/deps/base64/base64/test/test_base64.c
index bec52d146c8..94aad2d489b 100644
--- a/deps/base64/base64/test/test_base64.c
+++ b/deps/base64/base64/test/test_base64.c
@@ -1,6 +1,7 @@
 #include <stdbool.h>
 #include <string.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include "../include/libbase64.h"
 #include "codec_supported.h"
 #include "moby_dick.h"
@@ -92,7 +93,7 @@ assert_roundtrip (int flags, const char *src)
 }
 
 static int
-test_char_table (int flags)
+test_char_table (int flags, bool use_malloc)
 {
 	bool fail = false;
 	char chr[256];
@@ -107,8 +108,24 @@ test_char_table (int flags)
 	for (int i = 0; i < 256; i++) {
 
 		size_t chrlen = 256 - i;
+		char* src = &chr[i];
+		if (use_malloc) {
+			src = malloc(chrlen); /* malloc/copy this so valgrind can find out-of-bound access */
+			if (src == NULL) {
+				printf(
+					"FAIL: encoding @ %d: allocation of %lu bytes failed\n",
+					i, (unsigned long)chrlen
+				);
+				fail = true;
+				continue;
+			}
+			memcpy(src, &chr[i], chrlen);
+		}
 
-		base64_encode(&chr[i], chrlen, enc, &enclen, BASE64_FORCE_PLAIN);
+		base64_encode(src, chrlen, enc, &enclen, flags);
+		if (use_malloc) {
+			free(src);
+		}
 
 		if (!base64_decode(enc, enclen, dec, &declen, flags)) {
 			printf("FAIL: decoding @ %d: decoding error\n", i);
@@ -198,6 +215,11 @@ test_streaming (int flags)
 		while (base64_stream_decode(&state, &ref[inpos], (inpos + bs > reflen) ? reflen - inpos : bs, &enc[enclen], &partlen)) {
 			enclen += partlen;
 			inpos += bs;
+
+			// Has the entire buffer been consumed?
+			if (inpos >= 400) {
+				break;
+			}
 		}
 		if (enclen != 256) {
 			printf("FAIL: stream decoding gave incorrect size: "
@@ -336,7 +358,8 @@ test_one_codec (const char *codec, int flags)
 		fail |= assert_roundtrip(flags, vec[i].out);
 	}
 
-	fail |= test_char_table(flags);
+	fail |= test_char_table(flags, false); /* test with unaligned input buffer */
+	fail |= test_char_table(flags, true); /* test for out-of-bound input read */
 	fail |= test_streaming(flags);
 	fail |= test_invalid_dec_input(flags);
 
diff --git a/doc/contributing/maintaining/maintaining-dependencies.md b/doc/contributing/maintaining/maintaining-dependencies.md
index 9c2e3485271..dc78a9dd2b5 100644
--- a/doc/contributing/maintaining/maintaining-dependencies.md
+++ b/doc/contributing/maintaining/maintaining-dependencies.md
@@ -10,7 +10,7 @@ This a list of all the dependencies:
 
 * [acorn 8.11.2][]
 * [ada 2.7.2][]
-* [base64 0.5.0][]
+* [base64 0.5.1][]
 * [brotli 1.0.9][]
 * [c-ares 1.20.1][]
 * [cjs-module-lexer 1.2.2][]
@@ -155,7 +155,7 @@ an abstract syntax tree walker for the ESTree format.
 The [ada](https://github.com/ada-url/ada) dependency is a
 fast and spec-compliant URL parser written in C++.
 
-### base64 0.5.0
+### base64 0.5.1
 
 The [base64](https://github.com/aklomp/base64) dependency is a base64
 stream encoding/decoding library in C99 with SIMD and OpenMP acceleration.
@@ -320,7 +320,7 @@ performance improvements not currently available in standard zlib.
 
 [acorn 8.11.2]: #acorn-8112
 [ada 2.7.2]: #ada-272
-[base64 0.5.0]: #base64-050
+[base64 0.5.1]: #base64-051
 [brotli 1.0.9]: #brotli-109
 [c-ares 1.20.1]: #c-ares-1201
 [cjs-module-lexer 1.2.2]: #cjs-module-lexer-122
diff --git a/src/base64_version.h b/src/base64_version.h
index fa492a293b4..c3737f4beeb 100644
--- a/src/base64_version.h
+++ b/src/base64_version.h
@@ -2,5 +2,5 @@
 // Refer to tools/dep_updaters/update-base64.sh
 #ifndef SRC_BASE64_VERSION_H_
 #define SRC_BASE64_VERSION_H_
-#define BASE64_VERSION "0.5.0"
+#define BASE64_VERSION "0.5.1"
 #endif  // SRC_BASE64_VERSION_H_