diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index e61550c6..f4381bf1 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:e5f1d999fc5b89aa3fe7ce85b54c9cc64d0d16ec20de1adc87e7099ae951ffcc
 FROM ghcr.io/rails/devcontainer/images/ruby:$RUBY_VERSION