diff --git a/docs/Gemfile b/docs/Gemfile
index 42261e2..712e3de 100644
--- a/docs/Gemfile
+++ b/docs/Gemfile
@@ -4,7 +4,7 @@ source "https://rubygems.org"
 
 # gem "rails"
 gem 'wdm', '>= 0.1.0' if Gem.win_platform?
-gem "github-pages", group: :jekyll_plugins
+gem "github-pages", ">= 229", group: :jekyll_plugins
 gem "webrick", "~> 1.8"
 gem "jekyll-avatar"
 gem "jekyll-sitemap"