diff --git a/Gemfile b/Gemfile
index 1097bb8..f01846d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -16,6 +16,7 @@ source "https://rubygems.org"
 gem "jekyll"
 gem "minimal-mistakes-jekyll"
 gem "jekyll-sitemap"
+gem "webrick"
 
 # The following plugins are automatically loaded by the theme-gem:
 #   gem "jekyll-paginate"
diff --git a/Gemfile.lock b/Gemfile.lock
index c8dddb1..bc46700 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -83,6 +83,7 @@ GEM
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     unicode-display_width (1.7.0)
+    webrick (1.7.0)
 
 PLATFORMS
   ruby
@@ -91,6 +92,7 @@ DEPENDENCIES
   jekyll
   jekyll-sitemap
   minimal-mistakes-jekyll
+  webrick
 
 BUNDLED WITH
-   2.1.4
+   2.2.22