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://github.com/belluzj/fantasque-sans/releases .*[^n]/(?:|v|version-|version|release-|r|REL_|rel-|fonts-fantasque-sans(?:_|-))(\d[^\s/]*)\.(?:tar\.xz|txz|tar\.bz2|tbz2|tar\.gz|tgz)