-# Gems used only for assets and not required
-# in production environments by default.
-group :assets do
- gem 'sass-rails', '>= 3.2.0'
- gem 'coffee-rails', '~> 3.2.0'
-
- # See https://github.com/sstephenson/execjs#readme for more supported runtimes
- gem 'therubyracer'
-
- gem 'uglifier', '>= 1.0.3'
-end
+# for building assets
+gem 'sass-rails', '~> 4.0'
+gem 'coffee-rails', '~> 4.0'
+gem 'therubyracer'
+gem 'uglifier', '~> 2.0'