diff --git a/outline/docker-compose.yml b/outline/docker-compose.yml
index f569434..052f474 100644
--- a/outline/docker-compose.yml
+++ b/outline/docker-compose.yml
@@ -28,7 +28,7 @@ services:
 
   postgres:
     container_name: outline_postgres
-    image: postgres
+    image: postgres:13
     env_file: ./docker.env
     ports:
       - "5432:5432"