vivid package: upgrade fails

Hi,

maybe I'm too stupid or to blind to see ...

I updated my server to vivid and expected the redmine version to be something like "3.0~20140825-5" according to the output of
apt-cache show redmine | grep Version

But https://hostname/redmine/admin/info show still "2.5.2.devel" like before the release upgrade.

Forced re-installtion of the package didn't help.

Any ideas what I've done wrong?
Any hints or tips appreciated.

With regards,
yogi viegelinsch