@dzaporozhets Currently the gemfile says gem 'doorkeeper', '~> 2.1.3' and we have doorkeeper (2.1.4) in the lockfile. I think @pravi prefers to use a newer version.
@dzaporozhets we try to keep only one version of any library in debian (we keep multiple copies as a last resort) and debian already have doorkeeper 2.2.1. Since doorkeeper follows SemVer, ~> 2.2 would be enough to ensure compatibility. I'll send a merge request.