Steps to upgrade in Symfony 2.1 using composer
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I just testing new features on symfony 2.1-BETA3. Few hours ago BETA4 has been released but I don't know how to update BETA3 to BETA4 using composer. In 2.0.x release notes Fabien said:

>If you already have a project based on the Symfony Standard Edition 2.0.x, you can easily upgrade to 2.0.15 by getting the new deps and deps.lock files.

Have I replace my composer.lock file? What about my own requires like:

    "package": "stof/doctrine-extensions-bundle",
    "version": "dev-master",
    "source-reference": "36356b158b74cb68f96dc0b657e8732422b9d5dd",
    "commit-date": "1341954345"
