diff --git a/gemfiles/Gemfile.rails-6.0 b/gemfiles/Gemfile.rails-6.0
index 63ca66f..b39dc5e 100644
--- a/gemfiles/Gemfile.rails-6.0
+++ b/gemfiles/Gemfile.rails-6.0
@@ -27,4 +27,5 @@ end
 
 if RUBY_VERSION >= "3.4.0"
   gem "mutex_m"
+  gem "drb"
 end
diff --git a/gemfiles/Gemfile.rails-6.1 b/gemfiles/Gemfile.rails-6.1
index 72585bf..d7179ca 100644
--- a/gemfiles/Gemfile.rails-6.1
+++ b/gemfiles/Gemfile.rails-6.1
@@ -27,4 +27,5 @@ end
 
 if RUBY_VERSION >= "3.4.0"
   gem "mutex_m"
+  gem "drb"
 end
diff --git a/gemfiles/Gemfile.rails-7.0 b/gemfiles/Gemfile.rails-7.0
index 1919cbc..6ebbe2d 100644
--- a/gemfiles/Gemfile.rails-7.0
+++ b/gemfiles/Gemfile.rails-7.0
@@ -27,4 +27,5 @@ end
 
 if RUBY_VERSION >= "3.4.0"
   gem "mutex_m"
+  gem "drb"
 end