diff --git a/docker-compose.yml b/docker-compose.yml
index 54a8486..4f477f3 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -55,19 +55,6 @@ services:
     environment:
       - "DISCORD_WEBHOOK=${PROMETHEUS_DISCORD_WEBHOOK}"
 
-  postgres:
-    # Don't upgrade PostgreSQL by simply changing the version number
-    # You need to migrate the Database to the new PostgreSQL version
-    # When creating for the first time,
-    # you need to create codimd and cas users and databases.
-    image: postgres:9.6-alpine
-    restart: always
-    environment:
-      - POSTGRES_USER=postgres
-      - "POSTGRES_PASSWD=${POSTGRES_PASSWD}"
-    volumes:
-      - ./postgres_data:/var/lib/postgresql/data
-
   codimd:
     build: codimd
     restart: always