diff --git a/hooks/build b/hooks/build
index fd6163d..48a3c22 100755
--- a/hooks/build
+++ b/hooks/build
@@ -1,17 +1,12 @@
 #!/bin/bash
 set -eux
 
-declare -A arr
-arr[9]=3.6
-arr[10]=3.8
-arr[11]=3.10
-arr[12]=3.11
+source ./hooks/versions.sh
 
-
-for i in "${!arr[@]}"; do
+for pg_version in ${!VERSIONS[@]}; do
   docker build \
-         --build-arg "ALPINE_VERSION=${arr[$i]}" \
-         --tag "postgres-backup-s3:$i" \
+         --build-arg "ALPINE_VERSION=${VERSIONS[$pg_version]}" \
+         --tag "postgres-backup-s3:$pg_version" \
          .
 done
 
diff --git a/hooks/push b/hooks/push
index 7af6757..eafea32 100755
--- a/hooks/push
+++ b/hooks/push
@@ -1,10 +1,9 @@
 #!/bin/bash
-
 set -eux
 
-pg_versions=(9 10 11 12)
+source ./hooks/versions.sh
 
-for pg_ver in ${pg_versions[@]}; do
-  docker tag postgres-backup-s3:$pg_ver $DOCKER_REPO:$pg_ver
-  docker push $DOCKER_REPO:$pg_ver
+for pg_version in ${VERSIONS[@]}; do
+  docker tag postgres-backup-s3:$pg_version $DOCKER_REPO:$pg_version
+  docker push $DOCKER_REPO:$pg_version
 done
diff --git a/hooks/versions.sh b/hooks/versions.sh
new file mode 100755
index 0000000..af1e2ce
--- /dev/null
+++ b/hooks/versions.sh
@@ -0,0 +1,6 @@
+declare -A versions
+# VERSIONS[<postgres>]=<alpine>
+VERSIONS[9]=3.6
+VERSIONS[10]=3.8
+VERSIONS[11]=3.10
+VERSIONS[12]=3.11