apt-get update fail

polyzium@polypc-debian-b75m ~ % sudo apt-get update
[sudo] password for polyzium:
Hit http://ftp.de.debian.org jessie InRelease
Hit http://snapshot.debian.org wheezy InRelease
Get:1 http://ftp.de.debian.org jessie-updates InRelease [133 kB]
Ign http://ppa.launchpad.net trusty InRelease
Hit http://security.debian.org jessie/updates InRelease
Ign http://ppa.launchpad.net trusty InRelease
Ign http://ppa.launchpad.net trusty InRelease
E: Release file for http://snapshot.debian.org/archive/debian/20120616T042917Z/dists/wheezy/InRelease is expired (invalid since 1113d 7h 43min 42s). Updates for this repository will not be applied.