Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit 8.3 (exact version match: 8.3, 8.3.0 or 8.3.0.0), found phpunit/phpunit[8.3.0] but these were not loaded, because they are affected by security advisories ("PKSA-z3gr-8qht-p93v"). Go to https://packagist.org/security-advisories/ to find advisory details. To ignore the advisories, add them to the audit "ignore" config. To turn the feature off entirely, you can set "block-insecure" to false in your "audit" config. Problem 2 - Root composer.json requires orchestra/testbench 11.* -> satisfiable by orchestra/testbench[11.x-dev]. - orchestra/testbench 11.x-dev requires phpunit/phpunit ^11.5.50|^12.5.8 -> found phpunit/phpunit[11.5.50, ..., 11.5.x-dev, 12.5.8, ..., 12.5.x-dev] but it conflicts with your root composer.json require (8.3).