Upgrade GitLab Community Edition 7.4.3 to 10.X.X

Hey guys, I need help or information to update my GitLab Community Edition 7.4.3 to some version of 10.X.X. Gitlab has been installed using source.

Currently gitlab-ce-7.4.3 works great but we want an update. I already tried som tutorial/guides that i’ve foun but all of them fail at some point.

Thanks!