Follow The Step to Update Your PHP Version From cPanel:
1. Login to your cPanel.
2. Select MultiPHP Manager in the Software Section.
3. Select The Domain You Want To Update by Checking the Box On its Left Side.
4. Choose Your Preferred PHP Version From Dropdown, Then Click Appy.
5. There will be a Pop-Up in the Upper Right Corner, Notifying You that the change was Successful.