This screencast shows how to change the PHP version in WAMP. I realize the title says "upgrade" and the screencast goes through a downgrade, but the process of upgrading is the exact same. Further, this screencast is based off of a very popular blog post that I wrote on my site: https://john-dugan.com/upgrade-php-wamp/
That post is currently the number one search result for a number of terms related to upgrading PHP in WAMP (and has been for some time). I've recently upgraded to Windows 10 and decided to make a screencast to compliment the post. I encourage you to visit the post. Again, here is the link: https://john-dugan.com/upgrade-php-wamp/
Hope this screencast helps :-)