diff --git a/mattermost/docker-compose.yml b/mattermost/docker-compose.yml
index 4ea19fa..4735ee4 100644
--- a/mattermost/docker-compose.yml
+++ b/mattermost/docker-compose.yml
@@ -26,7 +26,7 @@ services:
     extra_hosts:
       - "${MM_EXTERNAL_HOST}"
   postgres-server:
-    image: postgres:latest
+    image: ${PG_IMAGE}
     environment:
       - POSTGRES_DB="${MM_POSTGRES_DB}"
       - POSTGRES_USER="${MM_POSTGRES_USER}"