diff --git a/docs/ref/contrib/gis/geoquerysets.txt b/docs/ref/contrib/gis/geoquerysets.txt
index 05454dff6f..cd8e8dabb1 100644
--- a/docs/ref/contrib/gis/geoquerysets.txt
+++ b/docs/ref/contrib/gis/geoquerysets.txt
@@ -1318,7 +1318,7 @@ Keyword Argument       Description
                        details.
 =====================  =====================================================
 
-__ https://docs.oracle.com/html/B14255_01/sdo_intro.htm#sthref150
+__ https://docs.oracle.com/database/121/SPATL/GUID-3BD00273-E74F-4830-9444-A3BB15AA0AC4.htm#SPATL466
 
 Example::
 
@@ -1415,6 +1415,6 @@ Example::
 
 .. rubric:: Footnotes
 .. [#fnde9im] *See* `OpenGIS Simple Feature Specification For SQL <http://www.opengis.org/docs/99-049.pdf>`_, at Ch. 2.1.13.2, p. 2-13 (The Dimensionally Extended Nine-Intersection Model).
-.. [#fnsdorelate] *See* `SDO_RELATE documentation <https://docs.oracle.com/cd/B19306_01/appdev.102/b14255/sdo_operat.htm#sthref845>`_, from Ch. 11 of the Oracle Spatial User's Guide and Manual.
+.. [#fnsdorelate] *See* `SDO_RELATE documentation <https://docs.oracle.com/database/121/SPATL/GUID-97C17C18-F05E-49B4-BE11-E89B972E2A02.htm#SPATL1039>`_, from the Oracle Spatial and Graph Developer's Guide.
 .. [#fncovers] For an explanation of this routine, read `Quirks of the "Contains" Spatial Predicate <http://lin-ear-th-inking.blogspot.com/2007/06/subtleties-of-ogc-covers-spatial.html>`_ by Martin Davis (a PostGIS developer).
 .. [#fncontainsproperly] Refer to the PostGIS ``ST_ContainsProperly`` `documentation <http://postgis.net/docs/ST_ContainsProperly.html>`_ for more details.
diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt
index aa25cd2c0e..7bcf2fc6ed 100644
--- a/docs/ref/models/querysets.txt
+++ b/docs/ref/models/querysets.txt
@@ -766,7 +766,7 @@ object. If it's ``None``, Django uses the :ref:`current time zone
 
     .. _pytz: http://pytz.sourceforge.net/
     .. _Time Zones: https://www.postgresql.org/docs/current/static/datatype-datetime.html#DATATYPE-TIMEZONES
-    .. _Choosing a Time Zone File: https://docs.oracle.com/cd/E11882_01/server.112/e10729/ch4datetime.htm#NLSPG258
+    .. _Choosing a Time Zone File: https://docs.oracle.com/database/121/NLSPG/ch4datetime.htm#NLSPG258
     .. _mysql_tzinfo_to_sql: https://dev.mysql.com/doc/refman/en/mysql-tzinfo-to-sql.html
 
 ``none()``
diff --git a/docs/ref/unicode.txt b/docs/ref/unicode.txt
index 6d1b269a57..3c29be550d 100644
--- a/docs/ref/unicode.txt
+++ b/docs/ref/unicode.txt
@@ -31,9 +31,9 @@ able to store certain characters in the database, and information will be lost.
 
 .. _MySQL manual: https://dev.mysql.com/doc/refman/en/charset-database.html
 .. _PostgreSQL manual: https://www.postgresql.org/docs/current/static/multibyte.html
-.. _Oracle manual: https://docs.oracle.com/cd/E11882_01/server.112/e10729/toc.htm
-.. _section 2: https://docs.oracle.com/cd/E11882_01/server.112/e10729/ch2charset.htm#NLSPG002
-.. _section 11: https://docs.oracle.com/cd/E11882_01/server.112/e10729/ch11charsetmig.htm#NLSPG011
+.. _Oracle manual: https://docs.oracle.com/database/121/NLSPG/toc.htm
+.. _section 2: https://docs.oracle.com/database/121/NLSPG/ch2charset.htm#NLSPG002
+.. _section 11: https://docs.oracle.com/database/121/NLSPG/ch11charsetmig.htm#NLSPG011
 
 All of Django's database backends automatically convert Unicode strings into
 the appropriate encoding for talking to the database. They also automatically