Updates-sources

Since some days I get announcements concerning updates.
Trying do follow I get the information: “Das Depot »http://deb.netrunner.com/dci/packages/netrunner netrunner-core-2001 Release« enthält keine Release-Datei mehr.”
What has to be done?

We are in the middle of upgrading servers. Please be patient until this is fixed.
edit: Please try again. It should work.

Please see this thread and follow it for updates: Synaptic Error