yum - Upgrading PHP - Missing Dependency php = 5.1.6 is needed by package php-eaccelerator

im trying to upgrade php from 5.1.6 to 5.2.1. When invoking the yum update php i get this message:

--> Finished Dependency Resolution php-eaccelerator-5.1.6_0.9.5.2-4.el5.rf.x86_64
from installed has depsolving problems

--> Missing Dependency: php = 5.1.6 is needed by package
php-eaccelerator-5.1.6_0.9.5.2-4.el5.rf.x86_64
(installed) Error: Missing Dependency:
php = 5.1.6 is needed by package
php-eaccelerator-5.1.6_0.9.5.2-4.el5.rf.x86_64
(installed) You could try using
--skip-broken to work around the problem You could try running:

package-cleanup --problems
package-cleanup --dupes
rpm -Va --nofiles --nodigest

The program package-cleanup is found in the yum-utils package.

The message is giving instructions but i really don't know how to proceed. This is a production server and it cannot be down for more than 1 minute.

Thanks for any ideas.

I only needed PHP 5.2.1 for the new json_decode() function. I added this and the upgrade was not longer necessary: http://snipplr.com/view/4964/emulate-php-5-for-backwards-compatibility/