title: How do I delete gems for old ruby versions installed by bundler?
body: <p>I want to free up disk space in my production environment taken up by gems installed for old ruby versions. I don't believe <code>bundle clean</code> will work in this instance, because I don't think it cleans out the old gems for other rubies. </p>
  
  <p>These gems are installed via capistrano and are installed in a custom location, rather than system wide. In my <code>/path/to/my-project/shared/bundle/ruby</code> dir, I see 2 subdirs - <code>2.2.0</code> &amp; <code>2.3.0</code>. Since I am now using ruby 2.3, is it safe just to delete the <code>2.2.0</code> directory? Is there anything else I need to do?</p>