WordPress has recently moved towards making the minimum version of their supported PHP 7.x — updating PHP on Fused couldn't prove easier. In addition to the performance benefits (upwards of 250%), there's the advantage of being on a supported PHP version from a security standpoint.

If you haven't taken the time to upgrade yet, there's no greater time than now.

Here's a document on upgrading PHP to 7.2 (or, at the very minimum, 7.1). 7.3 will be available shortly, and we'll send out an email blast when it's ready to go.

Upgrading PHP for WordPress