diff --git a/Dockerfile.release-tools b/Dockerfile.release-tools
index 9659cd4..f757792 100644
--- a/Dockerfile.release-tools
+++ b/Dockerfile.release-tools
@@ -1,4 +1,4 @@
-FROM ruby:2.4-alpine
+FROM ruby:2.5-alpine
 
 RUN apk add --update --no-cache build-base cmake git openssh-client openssl-dev