[tor-relays] Upgrading to 0.2.3.4 on Debian

[auto63557492 at hushmail.com]

I setup a relay to support the cause, but also as a means to learn
about Linux - still a long way to got on the latter, and so this
question:

I run aptitude regularly, and my sources.list includes "deb
http://deb.torproject.org/torprojects.org squeeze main" but there
are no updates coming through for tor beyond 0.2.1.29-1 on my ppc
platform. 

Should there be, or should I be doing something else to get to
0.2.3.4? Am I even asking the right question?

Thanks...