diff --git a/docker-compose.yml b/docker-compose.yml
index 0f7694ede..540062354 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,5 +1,5 @@
 sapldb:
-  image: postgres
+  image: postgres:9.6.8-alpine
   restart: always
   environment:
     POSTGRES_PASSWORD: sapl