Installing 4.0.0.beta

I had a patch that I was working on prior to the 3.2 RC drops. I
updated my fork which is now on 4.0.0.beta and can't get bundle
install to complete. It dies on the jquery-rails gem install because
of the railties ~> 3.0 dependency. Any help on getting 4.0.0.beta up
and running would be much appreciated.