The official PHP.net site has announced the release of the latest version in the PHP 7.1.x series: PHP 7.1.2:

The PHP development team announces the immediate availability of PHP 7.1.2. Several bugs have been fixed. All PHP 7.1 users are encouraged to upgrade to this version.

Bugs fixed include changes for DOM handling, FastCGI, hashing (adding http://php.net/hash_hkdf function), MySQL, OpenSSL and a good number of other locations. You can view the Changelog for the complete list. As always you can get this latest version from the main downloads page (source release) or windows.php.net for the Windows binaries.