Ruby on Rails

Hi Railsers,

I'm trying to install rails 5. I've tried both beta4 and rc1, but both fail with the same problem - installing the turbolinks gem. There seem to be a number of versions of the gem on RubyGems beta1 - beta4. There also seems to be beta5 (but it's not listed there). But I can't install any of them. It seems to be trying to build from the beta2 version of the -source gem, but that version doesn't exist.

I've tried:
# gem install turbolinks -v '5.0.0.beta2' --no-rdoc --no-ri
ERROR:  Could not find a valid gem 'turbolinks-source' (>= 0) in any repository
ERROR:  Possible alternatives: turbolinks, turbolinks-redirect, turbolinks-js, subtitle_source, rubygems-source

# gem install turbolinks -v '5.0.0.beta5' --no-rdoc --no-ri
ERROR:  Could not find a valid gem 'turbolinks' (= 5.0.0.beta5) in any repository
ERROR:  Possible alternatives: turbolinks

# gem install turbolinks  --no-rdoc --no-ri
ERROR:  While executing gem ... (Gem::DependencyError)
    Unresolved dependency found during sorting - rack (>= 1.0) (requested by rack-test-0.6.3)

# bundle install
An error occurred while installing turbolinks (5.0.0.beta2), and Bundler cannot continue.
Make sure that `gem install turbolinks -v '5.0.0.beta2'` succeeds before bundling.

I can install turbolinks-source (5.0.0.beta2) but that doesn't seem to help.

I successfully did this a few weeks ago, but now it's not working.

Thanks,
  Graham