diff --git a/Dockerfile b/Dockerfile
index 6a1e8776c..9c53b4145 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 FROM node:8.12.0-alpine as node
-FROM ruby:2.4.4-alpine3.7
+FROM ruby:2.4.5-alpine3.8
 
 LABEL maintainer="https://github.com/tootsuite/mastodon" \
       description="Your self-hosted, globally interconnected microblogging community"