Currently we're on 5.2.0. As of writing, four newer releases exist
https://github.com/phan/phan/releases/tag/5.2.1
https://github.com/phan/phan/releases/tag/5.3.0
https://github.com/phan/phan/releases/tag/5.3.1
https://github.com/phan/phan/releases/tag/5.3.2