The PHP.net site has posted an announcement about the latest release in the PHP 5.6.x series: PHP 5.6.30.
The PHP development team announces the immediate availability of PHP 5.6.30. This is a security release. Several security bugs were fixed in this release. All PHP 5.6 users are encouraged to upgrade to this version.
According to our release calendar, this PHP 5.6 version is the last planned release that contains regular bugfixes. All the consequent releases will contain only security-relevant fixes, for the term of two years. PHP 5.6 users that need further bugfixes are encouraged to upgrade to PHP 7.
If you'd like to view the full list of changes, head over to the Changelog for what was fixed and their related bug entries. As always you can download this latest release from the main downloads page for the source release and windows.php.net for the Windows binaries.