diff --git a/Gemfile b/Gemfile
index ceb1f322a03510f801940eb50cf147aba6aef7d4..34713a65a4c7768be57f90ee22bf184eaf002df9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -23,5 +23,5 @@ group :jekyll_plugins do
   gem "jekyll-paginate"
   gem "jekyll-sitemap"
   gem "jekyll-include-cache"
-  gem "jekyll-menus"
+  gem "jekyll-last-modified-at"
 end
diff --git a/_config.yml b/_config.yml
index 03403ac8e87032e216f70dd9d06564bba5945a66..a0fbc5565b64ef41186de351c7e215264ac87b1b 100644
--- a/_config.yml
+++ b/_config.yml
@@ -218,12 +218,14 @@ plugins:
   - jekyll-paginate
   - jekyll-sitemap
   - jekyll-include-cache
+  - jekyll-last-modified-at
 
 # mimic GitHub Pages with --safe
 whitelist:
   - jekyll-paginate
   - jekyll-sitemap
   - jekyll-include-cache
+  - jekyll-last-modified-at
 
 
 # Archives