diff --git a/Dockerfile-alpine.template b/Dockerfile-alpine.template
index 4d05f14d0..38e006153 100644
--- a/Dockerfile-alpine.template
+++ b/Dockerfile-alpine.template
@@ -1,4 +1,4 @@
-FROM php:%%PHP_VERSION%%-%%VARIANT%%3.14
+FROM php:%%PHP_VERSION%%-%%VARIANT%%3.15
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
diff --git a/update.sh b/update.sh
index 252aa29ba..a75c926c4 100755
--- a/update.sh
+++ b/update.sh
@@ -3,7 +3,6 @@ set -eo pipefail
 
 declare -A php_version=(
 	[default]='8.0'
-	[20]='7.4'
 	[21]='7.4'
 )