title: Ask budler not to upgrade a gem
body: <p>I am not able to run <code>bundle update devise</code> or <code>bundle install</code></p>
  
  <p><code>$ bundle update devise</code></p>
  
  <pre><code>Fetching gem metadata from http://rubygems.org/.............
  Fetching gem metadata from http://rubygems.org/..
  Resolving dependencies............
  Fetching rake 12.3.0 (was 10.1.0)
  Installing rake 12.3.0 (was 10.1.0)
  Gem::RuntimeRequirementNotMetError: rake requires Ruby version &gt;= 2.0.0. The current ruby version is 1.9.1.
  An error occurred while installing rake (12.3.0), and Bundler cannot continue.
  Make sure that `gem install rake -v '12.3.0'` succeeds before bundling.
  </code></pre>
  
  <p>and this is what I am getting on <code>$ bundle install</code></p>
  
  <pre><code>Fetching gem metadata from http://rubygems.org/.............
  Fetching gem metadata from http://rubygems.org/..
  You have requested:
    devise = 2.2.4
  
  The bundle currently has devise locked at 3.1.0.
  Try running `bundle update devise`
  
  If you are updating multiple gems in your Gemfile at once,
  try passing them all to `bundle update`
  </code></pre>
  
  <p>Thanks in advance</p>