diff --git a/Gemfile b/Gemfile
index 56a8a63..bb3e123 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,6 +4,6 @@ source 'https://rubygems.org' do
   gem 'activesupport', '~> 5.2', '>= 5.2.4.3'
   # and rubyzip too. >= 2.0.0 needs ruby 2.4
   gem 'rubyzip', '1.3.0'
-  gem 'github-pages', '204'
+  gem 'github-pages', group: :jekyll_plugins
   gem 'html-proofer', '3.15.3'
 end