title: from symfony 2.3.5 to symfony 2.3.6
body: <p>I am developing a project and I want to keep my code up to date with the latest stable versions of Symfony, now they have released the new stable version 2.3.6, and when I try to upgrade I receive the following error.</p>
  
  <pre><code>php composer.phar update
  Loading composer repositories with package information
  
  
  
    [ErrorException]     
    Undefined offset: 3  
  
  
  
  update [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--lock] [--no-plugins] [--no-custom-installers] [--no-scripts] [--no-progress] [--with-dependencies] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [packages1] ... [packagesN]
  </code></pre>