title: Installing Rails 4.2.0.beta1 – Bundler could not find compatible versions for gem "sprockets-rails"
body: <p>I've attempted to install Rails 4.2.0.beta1 (<a href="http://weblog.rubyonrails.org/2014/8/20/Rails-4-2-beta1/">released Aug 20, 2014</a>). I get an error <em>Bundler could not find compatible versions for gem "sprockets-rails"</em>. Here are the details:</p>
  
  <pre><code>$ bundle update rails
  Fetching gem metadata from https://rubygems.org/.........
  Fetching additional metadata from https://rubygems.org/..
  Resolving dependencies...
  Bundler could not find compatible versions for gem "sprockets-rails":
    In Gemfile:
      sass-rails (~&gt; 4.0.3) ruby depends on
        sprockets-rails (~&gt; 2.0) ruby
  
      rails (= 4.2.0.beta1) ruby depends on
        sprockets-rails (3.0.0.beta1)
  </code></pre>
  
  <p>How can I install Rails 4.2.0.beta1?</p>