As announced on the main PHP.net site today, the latest version in the PHP 5.5.x series has been made available for download - PHP 5.5.6:

The PHP development team announces the immediate availability of PHP 5.5.6. This release fixes some bugs against PHP 5.5.5, and adds some performance improvements.

Bugfixes in this latest release are updates to:

• the built-in CLI server
• the DateTime extension
• Updates to the filter extension
• Several OPCache-related fixes
• ...and more

As always, you can grab this latest download from the main downloads page or from windows.php.net for the Windows users out there.