title: Symfony2 Upgrading 2.2 to 2.3
body: <p>I just read about the new Symfony-Release: <a href="http://symfony.com/blog/symfony-2-3-0-the-first-lts-is-now-available" rel="noreferrer">Symfony-Blog</a>. It says <em>'Upgrading from 2.2 to 2.3 should be painless.'</em></p>
  
  <p>As I only have one project and have upgraded that from 2.0 to 2.2 mainly by building-new-from-scratch, I am a little bit afraid of <strong><em>'should be'</em></strong>.</p>
  
  <p>My project is build with composer.</p>
  
  <p>Which code has to be worked over and what exactly do I have to do migrate? I really can't find that on the symfony-site.</p>