On PHP.net today they've announced the release of PHP 5.4.12 and 5.3.22, the latest versions of the two current release branches.

The PHP development team announces the immediate availability of PHP 5.4.12 and PHP 5.3.22. These releases fix about 10 bugs. All users of PHP are encouraged to upgrade to PHP 5.4.12.

It's a bug fix release, but everyone's encouraged to update. It corrects things in core, FPM, sqlite, PDO_OCI, the Zend Engine and date functionality (and a bit more). You can get this latest version from the downloads page or windows.php.net for the Windows binaries. If you'd like to see the full list of issues fixed, check out the Changelog.