diff --git a/gemfiles/Gemfile-rails-edge b/gemfiles/Gemfile-rails-edge
index 6b71b30e..d40d8b01 100644
--- a/gemfiles/Gemfile-rails-edge
+++ b/gemfiles/Gemfile-rails-edge
@@ -4,6 +4,8 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 gem 'rails', github: 'rails/rails', branch: 'main'
 
+gem 'mutex_m'
+
 gemspec path: '../vite_ruby'
 gemspec path: '../vite_rails'
 gemspec path: '../vite_plugin_legacy'