diff --git a/Gemfile b/Gemfile
index 37f5eaa..4881e4f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,2 +1,3 @@
 source 'https://rubygems.org'
 gem 'github-pages', group: :jekyll_plugins
+gem "webrick", "~> 1.7"