Issue with Gemfile syntax

[hoffmabc]

There seems to be a syntax error where the line is:
gem 'warden_omniauth', git: "https://github.com/has.....

and should be:
gem 'warden_omniauth', :git => "https://github.com/has....

See LOG below:

Brians-MacBook-Pro:openid_connect_gateway brianhoffman$ bundle install
/Users/brianhoffman/Documents/RHEX/openid_connect_gateway/Gemfile:6:in evaluate': compile error /Users/brianhoffman/Documents/RHEX/openid_connect_gateway/Gemfile:6: syntax error, unexpected ':', expecting $end gem 'warden_omniauth', git: "https://github.com/hassox/wa... ^ (SyntaxError) /Library/Ruby/Gems/1.8/gems/bundler-1.1.5/lib/bundler/definition.rb:18:inbuild'
/Library/Ruby/Gems/1.8/gems/bundler-1.1.5/lib/bundler.rb:135:in definition' /Library/Ruby/Gems/1.8/gems/bundler-1.1.5/lib/bundler/cli.rb:220:ininstall'
/Library/Ruby/Gems/1.8/gems/bundler-1.1.5/lib/bundler/vendor/thor/task.rb:22:in send' /Library/Ruby/Gems/1.8/gems/bundler-1.1.5/lib/bundler/vendor/thor/task.rb:22:inrun'
/Library/Ruby/Gems/1.8/gems/bundler-1.1.5/lib/bundler/vendor/thor/invocation.rb:118:in invoke_task' /Library/Ruby/Gems/1.8/gems/bundler-1.1.5/lib/bundler/vendor/thor.rb:263:indispatch'
/Library/Ruby/Gems/1.8/gems/bundler-1.1.5/lib/bundler/vendor/thor/base.rb:386:in start' /Library/Ruby/Gems/1.8/gems/bundler-1.1.5/bin/bundle:13 /usr/bin/bundle:19:inload'
/usr/bin/bundle:19
There was an error in your Gemfile, and Bundler cannot continue.