title: Problems with sprockets when deploying Rails 3.1.rc4
body: <p>I'm sure that I am just overlooking something simple here but this has been driving me crazy all night! When trying to deploy a Rails 3.1.rc4 application to the Cedar stack on Heroku (I did this successfully a month ago with a similar Gemfile) I am receiving this error:</p>
  
  <pre><code>Could not find sprockets-2.0.0.beta.10 in any of the sources
  </code></pre>
  
  <p>My Gemfile looks like this:</p>
  
  <pre><code>source 'http://rubygems.org'
  
  # Core
  gem 'rails', '3.1.0.rc4'
  
  # Asset template engines
  gem 'sass-rails', "~&gt; 3.1.0.rc"
  gem 'coffee-script'
  gem 'uglifier'
  
  # Misc
  gem 'devise'
  gem 'jquery-rails'
  gem 'omniauth'
  gem 'fb_graph'
  gem 'compass', git: 'https://github.com/chriseppstein/compass.git', branch: 'rails31'
  gem 'haml'
  gem 'cancan'
  gem 'kaminari'
  gem 'friendly_id', '~&gt; 3.3.0', git: 'https://github.com/norman/friendly_id.git'
  gem 'recaptcha', :require =&gt; 'recaptcha/rails'
  gem 'aws-ses', '~&gt; 0.4.3', :require =&gt; 'aws/ses'
  
  # Local Environment
  group :test do
    # Pretty printed test output
    gem 'turn', :require =&gt; false
      gem 'sqlite3'
  end
  
  # Heroku Environment
  group :production do
      gem 'pg'
      gem 'execjs'
      gem 'therubyracer'
  end
  </code></pre>
  
  <p>After searching around and finding <a href="http://groups.google.com/group/rubyonrails-core/browse_thread/thread/59d8c7813b4d1bbe?pli=1" rel="nofollow">this article</a> on Google Groups, I determined that this must be fixable by adding this line</p>
  
  <pre><code>gem 'sprockets', '2.0.0.beta10'
  </code></pre>
  
  <p>to my Gemfile and then running</p>
  
  <pre><code>bundle update sprockets
  </code></pre>
  
  <p>This failed with</p>
  
  <pre><code>Could not find gem 'sprockets (= 2.0.0.beta10, runtime)' in any of the gem sources listed in your Gemfile.
  </code></pre>
  
  <p>and at this point I don't know what to do or how to handle this. Is it possible that I need to upgrade to Rails 3.1.rc5 and if so how may I do that without starting over from scratch?</p>
  
  <p>Thank you for any help that you can provide!</p>
  
  <p>-Robert</p>