title: How can I alter a gem on heroku?
body: <p>I recently deployed my app to heroku.  It uses Devise, which I had to alter the after_sign_up_path so it would redirect correctly to a set page after someone signs up.  This works fine locally, but when I deploy on heroku it installs the original unmodified devise gem.</p>
  
  <p>Does anyone know of a way to modify a gem on heroku, or to make it use the modified gem in my vendor folder?  </p>
  
  <p>Thanks.</p>