Debian Lenny PHP5 Upgrade

[viperiii]

What would be the right way to get my php5 up to 5.2.8 at least?

Currently at 5.2.6-1-lenny I think...

my apt/sources.list

Code:

deb http://ftp.debian.org/debian/ lenny main contrib non-free
deb-src http://ftp.debian.org/debian/ lenny main contrib non-free
deb http://security.debian.org/ lenny/updates main contrib non-free
deb-src http://security.debian.org/ lenny/updates main contrib non-free

When I tested a .deb source it caused too many issues..
should I attempt an upgrade to Squeeze?

reason I'm looking to upgrade is supporting Joomla 1.7 and some of rockettheme's new modules

- RokGallery: Needs a minimum PHP version of 5.2.8. You are running PHP version 5.2.6-1+lenny13
- The PHP Sqlite PDO driver is needed but not installed.

any ideas?

I can follow directions but still not good enough on my own... I break a lot of things when left to my own devices!