diff --git a/Dockerfile b/Dockerfile
index 475e896..4a24f4b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:latest
+FROM ubuntu:20.04
 
 ENV GITHUB_BRANCH=sample-java-webapp-1
 ENV TOMCAT_VERSION=8.5.50