how do you update xfce?

[Abstract Zzzxyz]

i recently changed from regular ubuntu to xubuntu (i've got an old machine). i love it, but how do you update it? i've seen the "download xfce 4.4.3" link at xfce.org, but what the hell do i do with a tarball? can i enable some xfce repository so i could update it with synaptic?

ps, i've got 4.4.2 now