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 ff042751..ec087225 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"
       }
     }