diff --git a/Gemfile b/Gemfile
index 8deb2688e07..f56f8d449fe 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,7 @@
 source "https://rubygems.org"
 
 gem "jekyll", "~> 4.2.0"
+gem "webrick", "~> 1.7"
 
 group :jekyll_plugins do
   gem "jekyll-feed", "~> 0.12"