diff --git a/Dockerfile b/Dockerfile
index d35d45d3..efff0ff0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@
 #
 
 # Pull base image.
-FROM ubuntu:14.04
+FROM ubuntu:trusty-20190515
 
 # Install.
 RUN \