Doorkeeper 5.5.0.rc2 released
Yesterday we released a new RC version of Doorkeeper gem with a number of improvements and fixes. GitLab already upgraded to it so we hope to see a stable release soon. If you haven't tried it yet - do it and report any issues you found. Please read the changelog before as this release has some breaking changes.
In the meantime you can read a great fresh article about How to implement Rails API authentication with Devise and Doorkeeper.