diff --git a/temp_file/Gemfile b/temp_file/Gemfile
index 04f6f28..b285b39 100644
--- a/temp_file/Gemfile
+++ b/temp_file/Gemfile
@@ -7,7 +7,7 @@ if $0.to_s.scan('bundle').length==0
   }
 end
 if RUBY_VERSION.to_f <= 2.1
-  gem 'concurrent-ruby', '~>1.1.9'
+  gem 'concurrent-ruby', '1.1.9'
 else
   gem 'concurrent-ruby'
 end