diff --git a/docker-compose.yaml b/docker-compose.yaml
index 5d740da..a4b2200 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -45,7 +45,7 @@ services:
       POSTGRES_USER: mailman
       POSTGRES_PASSWORD: mailmanpass
     restart: always
-    image: postgres:9.6
+    image: postgres:9.6-alpine
     volumes:
     - /opt/mailman/database:/var/lib/postgresql/data
     networks: