Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires orchestra/testbench 10.* -> satisfiable by orchestra/testbench[10.x-dev]. - orchestra/testbench 10.x-dev requires laravel/framework ^12.0 -> found laravel/framework[dev-master, 12.x-dev (alias of dev-master)] but it conflicts with your root composer.json require (10.*). Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.