diff --git a/lib/github-pages/dependencies.rb b/lib/github-pages/dependencies.rb
index 5d3f948..2da2c95 100644
--- a/lib/github-pages/dependencies.rb
+++ b/lib/github-pages/dependencies.rb
@@ -9,6 +9,7 @@ module GitHubPages
       # Jekyll
       "jekyll" => "3.9.5",
       "jekyll-sass-converter" => "1.5.2",
+      "webrick" => "1.8.1",
 
       # Converters
       "kramdown" => "2.4.0",