diff --git a/Gemfile b/Gemfile
index 13d043580..0b65ec6d5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ gem 'wdm', '~> 0.1.0', platforms: [:mswin, :mingw]
 gem 'tzinfo-data', platforms: [:mswin, :mingw, :jruby]
 
 # Include the tech docs gem
-gem 'govuk_tech_docs', git: 'https://github.com/shippedcode/tech-docs-gem.git'
+gem 'govuk_tech_docs', git: 'https://github.com/alphagov/tech-docs-gem.git', branch: 'http-prefix-support'
 
 # For helping with deployment
 gem 'middleman-gh-pages'
diff --git a/Gemfile.lock b/Gemfile.lock
index 9e4ceb193..80178c598 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,6 +1,7 @@
 GIT
-  remote: https://github.com/shippedcode/tech-docs-gem.git
-  revision: 2d3e9d72e14d02686a4a6dc7146c6592410b7442
+  remote: https://github.com/alphagov/tech-docs-gem.git
+  revision: 28855c05cabb311f311be8e12039151789c7dc29
+  branch: http-prefix-support
   specs:
     govuk_tech_docs (2.1.0)
       activesupport