Gemfile in arbre-1.1.1 vs Gemfile in arbre-1.2.0.rc1

@@ -1,18 +1,25 @@
 source 'http://rubygems.org'
 
 gemspec
 
-gem 'mime-types', '~> 2.6', platforms: :ruby_19
+gem 'rake'
 
 group :test do
   gem 'rspec'
-  gem 'rack'
   gem 'pry'
 end
 
+group :tools do
+  gem 'rubocop'
+end
+
+group :release do
+  gem 'chandler'
+end
+
 group :rails do
-  gem 'rails'
+  gem 'rails', '>= 5.0.0.1' # fixes CVE-2016-6316
   gem 'rspec-rails'
   gem 'combustion'
   gem 'capybara'
 end