Wed May 06, 2015 10:06 pm
It looks like 2.6.4 is available in Jessie.
Options:
1. Upgrade to Jessie.
2. You could try adding jessie sources to /etc/apt/sources.list and mix in whatever packages you need from Jessie (using APT-pinning is probably a good idea, so look that up if you want to try it -- /etc/apt/preferences or /etc/apt/preferences.d/somefilename)
3. Compile it from source (you might need other packages for it from Jessie anyway. I don't know.)
Good luck.