protected function isDrupalVmRequired() {
    $composer_json = json_decode(file_get_contents($this->getConfigValue('repo.root') . '/composer.json'), TRUE);
    return !empty($composer_json['require-dev']['geerlingguy/drupal-vm'])
      && $composer_json['require-dev']['geerlingguy/drupal-vm'] == $this->drupalVmVersionConstraint;
  }