diff --git a/Gemfile b/Gemfile
index 1815dfd5..a3502fbc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -104,7 +104,7 @@ gem 'settingslogic'
 # github-linquist needs pygments 0.4.2 but Gollum 2.4.11
 # requires pygments 0.3.2. The latest master Gollum has been updated
 # to use pygments 0.4.2. Change this after next Gollum release.
-gem "gollum", "~> 2.4.0", git: "git://github.com/github/gollum.git"
+gem "gollum", "~> 2.4.0", git: "git://github.com/gollum/gollum.git", ref: "5dcd3c8c8f"
 
 # Misc
 gem "foreman"