YAST Update PHP from 5.1.2 to 5.2.6?

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Hi,

I have Plesk 8.4 running on an openSUSE 10.1 System. For some reason PHP has still the version number 5.1.2.
When I want to update/install PHP it though YAST, PHP is marked with an i, which means, that it should stay to the installed version.

Why is that so? Has it to do with Plesk? What happens if I update it anyway?

Regards
Florian