The first step in the upgrade process is to upgrade your homebrew php instance
First update homebrew
1brew update
Next upgrade your version of php
1brew upgrade php
Next update your global composer instance
1composer global update
Install Valet
1valet install
Finally tell Valet to use your new version of php. At the time of writing this, we're using PHP 7.4
1valet use php@7.4
That's it. Your version of php on Laravel Valet should be updated. You can check by typing php -v
1PHP 7.4.4 (cli) (built: Mar 19 2020 20:12:27) ( NTS )2Copyright (c) The PHP Group3Zend Engine v3.4.0, Copyright (c) Zend Technologies4 with Zend OPcache v7.4.4, Copyright (c), by Zend Technologies