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.