diff --git a/Gemfile b/Gemfile
index ac8687c0..5ccb6702 100644
--- a/Gemfile
+++ b/Gemfile
@@ -5,7 +5,7 @@ group :jekyll do
     gem 'jekyll'
     gem 'jekyll-sitemap'
     gem 'jekyll-redirect-from'
-    gem 'jekyll-picture-tag', :git => 'git://github.com/kremalicious/jekyll-picture-tag.git'
+    gem 'jekyll-picture-tag', :git => 'git://github.com/kremalicious/jekyll-picture-tag.git', :branch => 'jekyll3'
     #gem 'jekyll-archives'
     gem 'jekyll-paginate'
 end
@@ -13,7 +13,11 @@ end
 group :development do
     gem 'redcarpet'
     gem 'mini_magick'
+end
+
+group :lsi do
     gem 'gsl'
     gem 'rb-gsl'
     gem 'narray'
+    gem 'classifier-reborn'
 end
diff --git a/_config.yml b/_config.yml
index a1a16331..43a98989 100644
--- a/_config.yml
+++ b/_config.yml
@@ -37,7 +37,6 @@ category_title_prefix:  ""
 
 future:                 false
 markdown:               redcarpet
-highlighter:            rouge
 
 redcarpet:
     extensions:         ['autolink', 'smart', 'hard_wrap']