Please note that according to the PHP version support timelines,
PHP 5.6.39 might be the last scheduled release of PHP 5.6 branch and
PHP 7.0.33 might be the last scheduled release of PHP 7.0 branch only if
no security issues arises, otherwise there will be additional releases
for both PHP 5.6 branch and PHP 7.0 branch . Hence if your PHP
installation is based on PHP 5.6 or PHP 7.0 then we would recommend
you to upgrade to PHP 7.1 or PHP 7.2 versions.
Let us know if you are facing any issues with upgrade, we will answering as many as we can.