diff --git a/plugins/oauth_provider/Gemfile b/plugins/oauth_provider/Gemfile
index e2e947e..d697794 100644
--- a/plugins/oauth_provider/Gemfile
+++ b/plugins/oauth_provider/Gemfile
@@ -1,2 +1,3 @@
 source 'https://rubygems.org'
 gem 'doorkeeper', '~> 1.4.0'
+gem 'responders', '~> 2.0'
--
libgit2 0.21.2