diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index e61550c..b0c774c 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -1,3 +1,3 @@
 # Make sure RUBY_VERSION matches the Ruby version in .ruby-version
-ARG RUBY_VERSION=3.4.8@sha256:5a3ff57d87764f57e3d30c308ad7738a9eb89fb416240e4cac9332e338a076b4
+ARG RUBY_VERSION=4.0.1@sha256:f1d59e565f58c2ce42a88b9f137ca4d9da739c0baa4401f75d3807f2241241b8
 FROM ghcr.io/rails/devcontainer/images/ruby:$RUBY_VERSION