YUM wont upgrade past 5.1.6?

[StarLion]

Anyone have any idea why yum wont update PHP further?

EDIT: Stupid form submitted itself.

Apache/2.2.3 (CentOS 5.4)

[Doug G]

Probably there is no newer version in the CentOS yum repositories. You can do yum list php (from command line) to find out what php is available in the repository.