composer.json

{
    "require": {
        "silex/silex": "1.0.*@dev",
        "symfony/browser-kit": "2.1.*",
        "symfony/console": "2.1.*",
        "symfony/config": "2.1.*",
        "symfony/css-selector": "2.1.*",
        "symfony/dom-crawler": "2.1.*",
        "symfony/filesystem": "2.1.*",
        "symfony/finder": "2.1.*",
        "symfony/form": "2.1.*",
        "symfony/locale": "2.1.*",
        "symfony/process": "2.1.*",
        "symfony/security": "2.1.*",
        "symfony/serializer": "2.1.*",
        "symfony/translation": "2.1.*",
        "symfony/validator": "2.1.*",
        "symfony/monolog-bridge": "2.1.*",
        "symfony/twig-bridge": "2.1.*",
        "monolog/monolog": ">=1.0.0,<1.2-dev",
        "twig/twig": ">=1.2.0,<2.0-dev",
        "doctrine/dbal": ">=2.2.0,<2.4.0-dev",
        "swiftmailer/swiftmailer": "4.1.*"
    }
}