The official PHP.net site has posted an announcement about the latest release in the PHP 7.1.x series: PHP 7.1.18.

The PHP development team announces the immediate availability of PHP 7.1.18. All PHP 7.1 users are encouraged to upgrade to this version.

A few bugs were fixed in this release including issues in FPM handling, internationalization functionality and Opcache. You can see the full changelog here and, as always, download the latest version either from the main downloads page or windows.php.net for the Windows binaries.