title: How to remove/uninstall an old version of a gem
body: <p>I updated a gem while I had the Rails server running and now I have two versions of the gem installed in my gemset.</p>
  <p>I updated using <code>bundle update bootstrap-sass</code> and now have both <code>2.0.1</code> and <code>2.0.2</code>.</p>
  <p>The server seems to be serving up the 2.0.2 version so I assume it should have removed the 2.0.1 version when it did the update and didn't because the gem was in use at the time.</p>
  <p>How can I update it properly so that the server will use 2.0.2 instead of 2.0.1, or how do I remove the 2.0.1 version of the gem?</p>