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: Josef Šimánek <firstname.lastname@example.org>
Date: Thu Jun 11 17:15:53 2020 -0300
Redefine Gem::Specification::rubyforge_project= only if it exists
It's gone with Rubygems 3.1.4.
Signed-off-by: Antonio Terceiro <email@example.com>