The PHP project has officially released the latest versions of the language in the PHP 5.5.x and PHP 7.0.x series: PHP 5.5.36 and PHP 7.0.7:

The PHP development team announces the immediate availability of PHP 5.5.36. This is a security release. Several security bugs were fixed in this release. All PHP 5.5 users are encouraged to upgrade to this version.

As always, you can download these latest releases from either the main downloads page (source) or from the windows.php.net site for the Windows binaries. For a full list of the changes, you can check out the Changelogs for each release.