https://gitlab.com/gitlab-org/gitlab-ce/issues/19670

Index: gitlab/Gemfile
===================================================================
--- gitlab.orig/Gemfile
+++ gitlab/Gemfile
@@ -69,7 +69,7 @@ gem 'gollum-rugged_adapter', '~> 0.4.2',
 gem 'github-linguist', '~> 4.7', require: 'linguist'
 
 # API
-gem 'grape',        '~> 0.13.0'
+gem 'grape',        '~> 0.16.0'
 gem 'grape-entity', '~> 0.5.0'
 gem 'rack-cors',    '~> 0.4.0', require: 'rack/cors'