diff --git a/.config/redis.config.php b/.config/redis.config.php
index 2069812f..66a13d43 100644
--- a/.config/redis.config.php
+++ b/.config/redis.config.php
@@ -5,6 +5,7 @@ if (getenv('REDIS_HOST')) {
     'memcache.locking' => '\OC\Memcache\Redis',
     'redis' => array(
       'host' => getenv('REDIS_HOST'),
+      if (getenv('REDIS_HOST_USER')) { 'user' => getenv('REDIS_HOST_USER'), }
       'password' => getenv('REDIS_HOST_PASSWORD_FILE') ? trim(file_get_contents(getenv('REDIS_HOST_PASSWORD_FILE'))) : (string) getenv('REDIS_HOST_PASSWORD'),
     ),
   );
@@ -14,8 +15,4 @@ if (getenv('REDIS_HOST')) {
   } elseif (getenv('REDIS_HOST')[0] != '/') {
     $CONFIG['redis']['port'] = 6379;
   }
-
-  if (getenv('REDIS_HOST_USER') !== false) {
-    $CONFIG['redis']['user'] = (string) getenv('REDIS_HOST_USER');
-  }
 }
diff --git a/28/fpm-alpine/Dockerfile b/28/fpm-alpine/Dockerfile
index 63569f89..02cd4a23 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-alpine3.21
+FROM php:8.2-fpm-alpine3.20
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
diff --git a/29/fpm-alpine/Dockerfile b/29/fpm-alpine/Dockerfile
index 6e4ea4d1..4e147a5c 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-alpine3.21
+FROM php:8.2-fpm-alpine3.20
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
diff --git a/30/fpm-alpine/Dockerfile b/30/fpm-alpine/Dockerfile
index 9bd77015..52ea716c 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-alpine3.21
+FROM php:8.2-fpm-alpine3.20
 
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
diff --git a/update.sh b/update.sh
index 89f3d6f2..6e576238 100755
--- a/update.sh
+++ b/update.sh
@@ -2,7 +2,7 @@
 set -eo pipefail
 
 declare -A alpine_version=(
-	[default]='3.21'
+	[default]='3.20'
 )
 
 declare -A debian_version=(
diff --git a/versions.json b/versions.json
index 09f25557..ec8b3ca9 100644
--- a/versions.json
+++ b/versions.json
@@ -20,7 +20,7 @@
       "fpm-alpine": {
         "variant": "fpm-alpine",
         "base": "alpine",
-        "baseVersion": "3.21",
+        "baseVersion": "3.20",
         "phpVersion": "8.2"
       }
     }
@@ -46,7 +46,7 @@
       "fpm-alpine": {
         "variant": "fpm-alpine",
         "base": "alpine",
-        "baseVersion": "3.21",
+        "baseVersion": "3.20",
         "phpVersion": "8.2"
       }
     }
@@ -72,7 +72,7 @@
       "fpm-alpine": {
         "variant": "fpm-alpine",
         "base": "alpine",
-        "baseVersion": "3.21",
+        "baseVersion": "3.20",
         "phpVersion": "8.2"
       }
     }