Here are updated packages in the Yum repository:
The PHP 5.5.0 release is out now for CentOS/RHEL 6 on the Webtatic Yum repository. More information can be found at PHP 5.5 for CentOS 6.4 via yum. The packages have been in testing since the PHP 5.5.0alpha2 release.
PHP.net has also announced that PHP 5.3 will only be receiving critical fixes from now on. Webtatic will continue to provide any of these fixes for CentOS 5.