upgrade to Wheezy ?

i highly recommand you to NOT dist-upgrade to Debian Wheezy with livarp_0.3.9, as many added packages can enter in conflict with official Debain wheezy packages.

if you still want to dist-upgrade, just uncomment the dedicated lines in your /etc/apt/sources.list file, modify the preferences repositories order in your /etc/apt/preferences file, and launch the dist-upgrade :)