diff --git a/engine/examples/postgresql_service.Dockerfile b/engine/examples/postgresql_service.Dockerfile
index 9ee667e..8a3ab33 100644
--- a/engine/examples/postgresql_service.Dockerfile
+++ b/engine/examples/postgresql_service.Dockerfile
@@ -2,7 +2,7 @@
 # example Dockerfile for https://docs.docker.com/examples/postgresql_service/
 #
 
-FROM ubuntu
+FROM ubuntu:kinetic
 
 # Add the PostgreSQL PGP key to verify their Debian packages.
 # It should be the same key as https://www.postgresql.org/media/keys/ACCC4CF8.asc