MultiPHP not available in WHM

All of the websites I manage appear to be stuck on PHP v5.4 and Wordpress will not update unless it's on 5.6. I can change the domain PHP in MultiPHP in Cpanel. But the system PHP remains at 5.4 (see attachment). Doing some research, I've learned we can change the system PHP version in WHM. However, I do not have MultiPHP in my WHM dashboard (see attachment). I am the reseller of this account and should have full access. I've checked every available option in the WHM dashboard but there's nothing for MultiPHP or Software or any other PHP option. Any suggestions on what I can do to update PHP on my websites?