Gemfile in nanoc-4.7.10 vs Gemfile in nanoc-4.7.11

@@ -19,11 +19,11 @@
   gem 'rake'
   gem 'rdoc', '~> 5.0'
   gem 'rspec'
   gem 'rspec-its', '~> 1.2'
   gem 'rspec-mocks'
-  gem 'rubocop', github: 'bbatsov/rubocop'
+  gem 'rubocop', '~> 0.49'
   gem 'simplecov', require: false
   gem 'timecop'
   gem 'vcr'
   gem 'webmock'
   gem 'yard'
@@ -42,17 +42,18 @@
   gem 'fog'
   gem 'haml'
   gem 'handlebars', platforms: :ruby
   gem 'kramdown'
   gem 'less', '~> 2.0', platforms: :ruby
+  gem 'libv8', platforms: :ruby
   gem 'listen'
   gem 'markaby'
   gem 'maruku'
   gem 'mime-types'
   gem 'mustache', '~> 1.0'
   gem 'nokogiri', '~> 1.6'
-  gem 'nokogumbo', '~> 1.4'
+  gem 'nokogumbo', '~> 1.4', platforms: :ruby
   gem 'pandoc-ruby'
   gem 'pygments.rb', '~> 1.1', '>= 1.1.1', platforms: %i[ruby mswin]
   gem 'rack'
   gem 'rainpress'
   gem 'rdiscount', '~> 2.2', platforms: %i[ruby mswin]
@@ -60,10 +61,10 @@
   gem 'RedCloth', platforms: :ruby
   gem 'rouge'
   gem 'rubypants'
   gem 'sass'
   gem 'slim', '~> 3.0'
-  gem 'therubyracer', '~> 0.12'
+  gem 'therubyracer', '~> 0.12', platforms: :ruby
   gem 'typogruby'
   gem 'uglifier'
   gem 'w3c_validators'
   gem 'yuicompressor'
 end