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: W. Martin Borgert <email@example.com>
Date: Sat Sep 8 08:28:55 2018 +0000
advance dateutil from recommends to depends, because a user was bitten by it