diff --git a/Dockerfile.development b/Dockerfile.development
index f2bc1843..b1b8354c 100644
--- a/Dockerfile.development
+++ b/Dockerfile.development
@@ -1,5 +1,5 @@
 # This is for development or CI only
-FROM docker.io/ruby:3.4.8-alpine3.23 AS common
+FROM docker.io/ruby:4.0.0-alpine3.23 AS common
 
 RUN apk update \
     && apk upgrade \
diff --git a/Dockerfile.production b/Dockerfile.production
index 6bbc7f71..ae18ea25 100644
--- a/Dockerfile.production
+++ b/Dockerfile.production
@@ -1,4 +1,4 @@
-FROM docker.io/ruby:3.4.8-alpine3.23 AS base
+FROM docker.io/ruby:4.0.0-alpine3.23 AS base
 
 RUN apk update \
     && apk upgrade \