diff --git a/Gemfile b/Gemfile
index fd714b5..62f2ec5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,35 +1,11 @@
 source 'https://rubygems.org'
 
-gem "github-pages",         group: :jekyll_plugins
-
-gem "tzinfo-data"
-gem "wdm", "~> 0.1.0" if Gem.win_platform?
-
-gem 'webrick'
-
 group :jekyll_plugins do
-    # from mm
-    gem "jekyll-paginate"
-    gem "jekyll-sitemap"
-    gem "jekyll-gist"
-    gem "jekyll-feed"
-    gem "jemoji"
-    gem "jekyll-include-cache"
-    gem "jekyll-algolia"
+    
+    gem 'github-pages', '~> 228'
 
     # mine
-    gem 'jekyll-menus'
-    gem 'jekyll-leaflet'
-    gem 'jekyll-contentblocks'
-    gem 'jekyll-target-blank'       # open external links in new window
-    #gem 'jekyll-mermaid'
-    #gem 'jekyll-spaceship'
-    #gem "jekyll-last-modified-at"   # last update of a post
-    #gem 'jekyll-toc'
-    #gem 'jekyll-archives'
-    
-    # https://github.com/heychirag/jekyll-google-photos/issues/14
-    # https://stackoverflow.com/questions/2577346/how-to-install-gem-from-github-source
-    # fix: https://stackoverflow.com/a/28442337
-    #gem 'jekyll-google-photos', git: 'https://github.com/edewit/jekyll-google-photos.git', branch: 'patch-1'
+    gem 'jekyll-target-blank'           # open external links in new window
+    #gem "jekyll-last-modified-at"      # last update of a post
+
 end