diff --git a/.env b/.env
index 74425e9..8591ddd 100644
--- a/.env
+++ b/.env
@@ -1,5 +1,6 @@
 IMAGE_REPO=zammad/zammad-docker-compose
 MEMCACHE_SERVERS=zammad-memcached:11211
+POSTGRES_VERSION=15.1-alpine
 POSTGRES_PASS=zammad
 POSTGRES_USER=zammad
 REDIS_URL=redis://zammad-redis:6379
diff --git a/docker-compose.yml b/docker-compose.yml
index cfed73d..614a98b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -14,7 +14,7 @@ services:
       - HOLD_DAYS=10
       - POSTGRESQL_USER=${POSTGRES_USER}
       - POSTGRESQL_PASSWORD=${POSTGRES_PASS}
-    image: postgres:15.0-alpine
+    image: postgres:${POSTGRES_VERSION}
     restart: ${RESTART}
     volumes:
       - zammad-backup:/var/tmp/zammad
@@ -61,7 +61,7 @@ services:
     environment:
       - POSTGRES_USER=${POSTGRES_USER}
       - POSTGRES_PASSWORD=${POSTGRES_PASS}
-    image: postgres:15.1-alpine
+    image: postgres:${POSTGRES_VERSION}
     restart: ${RESTART}
     volumes:
       - postgresql-data:/var/lib/postgresql/data