diff --git a/gemfiles/actionpack-7.0.gemfile b/gemfiles/actionpack-7.0.gemfile
index 00fd5ad..b424ade 100644
--- a/gemfiles/actionpack-7.0.gemfile
+++ b/gemfiles/actionpack-7.0.gemfile
@@ -7,3 +7,4 @@ gemspec path: '../'
 gem 'railties', '~> 7.0.0'
 gem 'actionpack', '~> 7.0.0'
 gem 'nokogiri', '~> 1.18'
+gem 'mutex_m'
diff --git a/gemfiles/actionpack-7.0.gemfile.lock b/gemfiles/actionpack-7.0.gemfile.lock
index 1454ff2..06e18d3 100644
--- a/gemfiles/actionpack-7.0.gemfile.lock
+++ b/gemfiles/actionpack-7.0.gemfile.lock
@@ -41,6 +41,7 @@ GEM
       nokogiri (>= 1.12.0)
     method_source (1.1.0)
     minitest (5.25.4)
+    mutex_m (0.3.0)
     nokogiri (1.18.1-aarch64-linux-gnu)
       racc (~> 1.4)
     nokogiri (1.18.1-aarch64-linux-musl)
@@ -118,6 +119,7 @@ PLATFORMS
 DEPENDENCIES
   actionpack (~> 7.0.0)
   country_select!
+  mutex_m
   nokogiri (~> 1.18)
   pry (~> 0)
   railties (~> 7.0.0)