diff --git a/Gemfile b/Gemfile
index 5637e5f..90bcd74 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'http://rubygems.org'
 
-gem 'rails', '3.1.0'
+gem 'rails', '4.0.0'
 gem 'newrelic_rpm'
 # Bundle edge Rails instead:
 # gem 'rails',     :git => 'git://github.com/rails/rails.git'
@@ -12,12 +12,12 @@ gem 'json'
 # Gems used only for assets and not required
 # in production environments by default.
 group :assets do
-  gem 'sass-rails', "  ~> 3.1.0"
-  gem 'coffee-rails', "~> 3.1.0"
+  gem 'sass-rails', '~> 6.0.0'
+  gem 'coffee-rails', '~> 4.0.0'
   gem 'uglifier'
 end
 
-gem 'jquery-rails'
+gem 'jquery-rails', '>= 4.0.0'
 
 # Use unicorn as the web server
 # gem 'unicorn'