Gemfile in therubyracer-0.12.2 vs Gemfile in therubyracer-0.12.3

@@ -1,11 +1,12 @@
 source 'http://rubygems.org'
 
 gemspec
 
-gem "rubysl", :platforms => :rbx
-gem 'redjs', :git => 'https://github.com/cowboyd/redjs.git'
-gem "rake"
-gem "rspec", "~> 2.0"
-gem "rake-compiler"
-gem "gem-compiler", :platforms => :mri
-
+group :development do
+  gem "rubysl", :platforms => :rbx
+  gem 'redjs', :git => 'https://github.com/cowboyd/redjs.git'
+  gem "rake"
+  gem "rspec", "~> 3.5.0"
+  gem "rake-compiler"
+  gem "gem-compiler", :platforms => :mri
+end