diff --git a/integration/apps/rails-seven/Gemfile b/integration/apps/rails-seven/Gemfile
index cc39a6c097d..ae6d3eba4e5 100644
--- a/integration/apps/rails-seven/Gemfile
+++ b/integration/apps/rails-seven/Gemfile
@@ -3,6 +3,9 @@ require 'datadog/demo_env'
 source "https://rubygems.org"
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
+gem 'bigdecimal'
+gem 'mutex_m'
+
 # Bundle edge Rails instead: gem "rails", github: "rails/rails", branch: "main"
 gem "rails", "~> 7.0.5"
 
diff --git a/integration/apps/rails-six/Gemfile b/integration/apps/rails-six/Gemfile
index 70a3073a631..d0a251382d1 100644
--- a/integration/apps/rails-six/Gemfile
+++ b/integration/apps/rails-six/Gemfile
@@ -4,6 +4,8 @@ source "https://rubygems.org"
 
 rails_version = ['~> 6.1']
 
+gem 'mutex_m'
+
 gem 'actioncable', *rails_version
 gem 'actionmailer', *rails_version
 gem 'actionpack', *rails_version