The PHP.net site has announced the release to two new versions of PHP in the 5.5.x and 5.6.x series: PHP 5.5.30 and PHP 5.6.14:

he PHP development team announces the immediate availability of [these versions]. This is a security release. Two security bugs were fixed in this release. All PHP [5.5 and 5.6] users are encouraged to upgrade to this version.

As always, you can grab these latest stable versions from the main downloads page or the windows.php.net site for the Windows binaries. If you're interested in the bugs fixed here, check out the full Changelog.