Gemfile in keen-0.8.3 vs Gemfile in keen-0.8.4

@@ -1,9 +1,9 @@
 source "https://rubygems.org"
 
 group :development, :test do
   gem 'rake'
-  gem 'rspec'
+  gem 'rspec', '~>2'
   gem 'em-http-request'
   gem 'em-synchrony', :require => false
   gem 'webmock'
 end