How we migrated application servers from Unicorn to Puma It's been a long journey but with the release of GitLab 13.0 Puma is our default application server. Here's what we did and learned along the way. It’s been years in the making, but our journey to migrate our application servers from Unicorn to Puma is complete. With the Gitlab 12.9 release Puma was running on GitLab.com and now with 13.0 it