diff --git a/docker/php71/Dockerfile b/docker/php71/Dockerfile
index 9fbedb2..b92ab22 100644
--- a/docker/php71/Dockerfile
+++ b/docker/php71/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu
+FROM ubuntu:kinetic
 
 ENV DEBIAN_FRONTEND noninteractive
 RUN apt-get update