On the main PHP.net site they've posted an announcement about the latest release in the PHP 7.1.x series - PHP 7.1.4:

The PHP development team announces the immediate availability of PHP 7.1.4. Several bugs have been fixed. All PHP 7.1 users are encouraged to upgrade to this version.

Bugfixes in this release include changes in Core, Apache, DOM, Opcache and OpenSSL functionality. As always, this latest release can be downloaded from the main downloads page on the PHP.net site (source) and windows.php.net for the Windows binaries. If you'd like to view the full list of changes and see links to the bugs they fix check out the full Changelog.