diff --git a/Dockerfile b/Dockerfile
index 82ecce10b4..189d424759 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.4
+FROM ruby:2.7.8
 
 LABEL maintainer Travis CI GmbH <support+travis-app-docker-images@travis-ci.com>