private function getSuluVersion($dir)
    {
        $version = '_._._';

        /** @var SplFileInfo $composerFile */
        $composerFile = new SplFileInfo($dir . '/composer.lock', '', '');
        if (!$composerFile->isFile()) {
            return $version;
        }

        $composer = json_decode($composerFile->getContents(), true);
        foreach ($composer['packages'] as $package) {
            if ('sulu/sulu' === $package['name']) {
                return $package['version'];
            }
        }

        return $version;
    }