diff --git a/Gemfile-rails-dependencies b/Gemfile-rails-dependencies
index 2985e675f..21a8eede9 100644
--- a/Gemfile-rails-dependencies
+++ b/Gemfile-rails-dependencies
@@ -49,6 +49,8 @@ when nil, false, ""
 else
   version_number = version.split(' ').last
 
+  gem 'concurrent-ruby', '1.3.4' if version_number < '7.1'
+
   gem "rails", version
   gem 'activerecord-jdbcsqlite3-adapter', platforms: [:jruby]