As mentioned on the main PHP site today, the latest version in the PHP 5.2 series has been released - PHP 5.2.13.
The PHP development team would like to announce the immediate availability of PHP 5.2.13. This release focuses on improving the stability of the PHP 5.2.x branch with over 40 bug fixes, some of which are security related. All users of PHP 5.2 are encouraged to upgrade to this release.
For more information about the changes included in this release you can check out the full release announcement or the Changelog. As always, you can get this latest version from the downloads page.