diff --git a/28/fpm-alpine/Dockerfile b/28/fpm-alpine/Dockerfile
index 02cd4a23..63569f89 100644
--- a/28/fpm-alpine/Dockerfile
+++ b/28/fpm-alpine/Dockerfile
@@ -1,5 +1,5 @@
 # DO NOT EDIT: created by update.sh from Dockerfile-alpine.template
-FROM php:8.2-fpm-alpine3.20
+FROM php:8.2-fpm-alpine3.21
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
diff --git a/29/fpm-alpine/Dockerfile b/29/fpm-alpine/Dockerfile
index 4e147a5c..6e4ea4d1 100644
--- a/29/fpm-alpine/Dockerfile
+++ b/29/fpm-alpine/Dockerfile
@@ -1,5 +1,5 @@
 # DO NOT EDIT: created by update.sh from Dockerfile-alpine.template
-FROM php:8.2-fpm-alpine3.20
+FROM php:8.2-fpm-alpine3.21
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
diff --git a/30/fpm-alpine/Dockerfile b/30/fpm-alpine/Dockerfile
index 52ea716c..9bd77015 100644
--- a/30/fpm-alpine/Dockerfile
+++ b/30/fpm-alpine/Dockerfile
@@ -1,5 +1,5 @@
 # DO NOT EDIT: created by update.sh from Dockerfile-alpine.template
-FROM php:8.2-fpm-alpine3.20
+FROM php:8.2-fpm-alpine3.21
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
diff --git a/Dockerfile-alpine.template b/Dockerfile-alpine.template
index de69eef2..28defa93 100644
--- a/Dockerfile-alpine.template
+++ b/Dockerfile-alpine.template
@@ -88,11 +88,12 @@ RUN set -ex; \
 # see https://docs.nextcloud.com/server/latest/admin_manual/installation/server_tuning.html#enable-php-opcache
 ENV PHP_MEMORY_LIMIT 512M
 ENV PHP_UPLOAD_LIMIT 512M
+ENV PHP_OPCACHE_MEMORY_CONSUMTION 128
 RUN { \
         echo 'opcache.enable=1'; \
         echo 'opcache.interned_strings_buffer=32'; \
         echo 'opcache.max_accelerated_files=10000'; \
-        echo 'opcache.memory_consumption=128'; \
+        echo 'opcache.memory_consumption=${PHP_OPCACHE_MEMORY_CONSUMTION}'; \
         echo 'opcache.save_comments=1'; \
         echo 'opcache.revalidate_freq=60'; \
         echo 'opcache.jit=1255'; \
diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
index 8b66dd34..e8d5b080 100644
--- a/Dockerfile-debian.template
+++ b/Dockerfile-debian.template
@@ -20,6 +20,7 @@ RUN set -ex; \
 # see https://docs.nextcloud.com/server/stable/admin_manual/installation/source_installation.html
 ENV PHP_MEMORY_LIMIT 512M
 ENV PHP_UPLOAD_LIMIT 512M
+ENV PHP_OPCACHE_MEMORY_CONSUMTION 128
 RUN set -ex; \
     \
     savedAptMark="$(apt-mark showmanual)"; \
@@ -97,7 +98,7 @@ RUN { \
         echo 'opcache.enable=1'; \
         echo 'opcache.interned_strings_buffer=32'; \
         echo 'opcache.max_accelerated_files=10000'; \
-        echo 'opcache.memory_consumption=128'; \
+        echo 'opcache.memory_consumption=${PHP_OPCACHE_MEMORY_CONSUMTION}'; \
         echo 'opcache.save_comments=1'; \
         echo 'opcache.revalidate_freq=60'; \
         echo 'opcache.jit=1255'; \
diff --git a/update.sh b/update.sh
index 6e576238..89f3d6f2 100755
--- a/update.sh
+++ b/update.sh
@@ -2,7 +2,7 @@
 set -eo pipefail
 
 declare -A alpine_version=(
-	[default]='3.20'
+	[default]='3.21'
 )
 
 declare -A debian_version=(
diff --git a/versions.json b/versions.json
index ec8b3ca9..09f25557 100644
--- a/versions.json
+++ b/versions.json
@@ -20,7 +20,7 @@
       "fpm-alpine": {
         "variant": "fpm-alpine",
         "base": "alpine",
-        "baseVersion": "3.20",
+        "baseVersion": "3.21",
         "phpVersion": "8.2"
       }
     }
@@ -46,7 +46,7 @@
       "fpm-alpine": {
         "variant": "fpm-alpine",
         "base": "alpine",
-        "baseVersion": "3.20",
+        "baseVersion": "3.21",
         "phpVersion": "8.2"
       }
     }
@@ -72,7 +72,7 @@
       "fpm-alpine": {
         "variant": "fpm-alpine",
         "base": "alpine",
-        "baseVersion": "3.20",
+        "baseVersion": "3.21",
         "phpVersion": "8.2"
       }
     }