title: How to set the default gemset in RVM with Rails & Heroku
body: <p>I need to <a href="https://devcenter.heroku.com/articles/ruby-versions" rel="nofollow">specify a ruby version in my Gemfile for Heroku</a>:</p>
  
  <pre><code>ruby '2.1.1'
  </code></pre>
  
  <p>That works as expected. However, it messes with my local terminal as well. I try to <a href="http://rvm.io/rubies/default" rel="nofollow">set the default ruby version and gemset in RVM</a> with:</p>
  
  <pre><code>$ rvm --default use ruby-2.1.1@rails4
  Using /Users/scott/.rvm/gems/ruby-2.1.1 with gemset rails4
  $ rvm gemset list
  
  gemsets for ruby-2.1.1 (found in /Users/scott/.rvm/gems/ruby-2.1.1)
     (default)
     global
  =&gt; rails4
  </code></pre>
  
  <p>Seems fine and it works as expected. However, if I open up another terminal shell I get this:</p>
  
  <pre><code>Last login: Fri Mar 14 16:54:23 on ttys009
  RVM used your Gemfile for selecting Ruby, it is all fine - Heroku does that too,
  you can ignore these warnings with 'rvm rvmrc warning ignore /Users/scott/code/Gemfile'.
  To ignore the warning for all files run 'rvm rvmrc warning ignore allGemfiles'.
  
  $ rvm gemset list
  
  gemsets for ruby-2.1.1 (found in /Users/scott/.rvm/gems/ruby-2.1.1)
  =&gt; (default)
     global
     rails4
  </code></pre>
  
  <p>I want it to use the <code>rails4</code> gemset always! How can I do this?</p>