Bug: https://gitlab.com/gitlab-org/gitlab-ce/issues/2814

--- a/Gemfile
+++ b/Gemfile
@@ -106,7 +106,7 @@
 gem 'github-markup', '~> 1.4'
 gem 'redcarpet',     '~> 3.3.3'
 gem 'RedCloth',      '~> 4.3.2'
-gem 'rdoc',          '~>3.6'
+gem 'rdoc',          '~> 4.1'
 gem 'org-ruby',      '~> 0.9.12'
 gem 'creole',        '~> 0.5.0'
 gem 'wikicloth',     '0.8.1'