Gemfile in mina-0.2.1 vs Gemfile in mina-0.3.0

@@ -2,9 +2,9 @@
 # Well, not all development dependencies install on all rubies. Moreover, `gem
 # install mina --development` doesn't work, as it will also try to install
 # development dependencies of our dependencies, and those are not conflict free.
 # So, here we are, `bundle install`.
 
-source :rubygems
+source "https://rubygems.org"
 gemspec
 
 gem 'rake', "~> #{ENV['rake'] || "0.9"}.0"