diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 0d6d7a02..c4d607fa 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=3.4.7
+ARG RUBY_VERSION=3.4.8@sha256:4acd870d1ad97d037a85647b516af866406b29a96fa6d93ceb38266d186b9c32
 FROM ghcr.io/rails/devcontainer/images/ruby:$RUBY_VERSION