diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index e61550c6..531ae360 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=3.4.9@sha256:5cf2d842c54eb8b289b3043a6ed26937225dac44ce46c1564833c85365b8345c
 FROM ghcr.io/rails/devcontainer/images/ruby:$RUBY_VERSION