The package has a debian/watch file, but the last attempt
to use it for checking for newer upstream versions failed with
an error:
In debian/watch no matching files for watch line https://api.github.com/repos/Mikachu/openbox/tags?per_page=50 https://api.github.com/repos/[^/]+/[^/]+/tarball/v?(?:[-_]?[Vv]?(\d[\-+\.:\~\da-zA-Z]*))