this package seems to have new commits in its VCS but has
not yet updated debian/changelog. You should consider updating
the Debian changelog and uploading this new version into the archive.
Here are the relevant commit logs:
Author: Hideki Yamane <email@example.com>
Date: Sat Feb 10 11:30:26 2018 +0900
Oh, xfonts-naga10 is non-free...