diff --git a/Gemfile.lock b/Gemfile.lock
index 0cd8918..0648787 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,8 +7,8 @@ GEM
       minitest (~> 5.1)
       tzinfo (~> 1.1)
       zeitwerk (~> 2.2)
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
@@ -253,6 +253,7 @@ DEPENDENCIES
   faraday (< 1.0)
   github-pages
   jekyll-feed (~> 0.12)
+  jekyll-github-metadata
   jekyll-octicons
   minima (~> 2.5)
   tzinfo (~> 1.2)