Your requirements could not be resolved to an installable set of packages. Problem 1 - orchestra/testbench[v7.0.0, ..., 7.x-dev] require phpunit/phpunit ^9.5.10 -> satisfiable by phpunit/phpunit[9.5.10, ..., 9.6.x-dev]. - You can only install one version of a package, so only one of these can be installed: phpunit/phpunit[9.5.10, ..., 9.6.x-dev, 10.1.1, ..., 10.5.x-dev, 11.0.0, ..., 11.1.x-dev]. - pestphp/pest v2.15.0 requires phpunit/phpunit ^10.3.2 -> satisfiable by phpunit/phpunit[10.3.2, ..., 10.5.x-dev]. - pestphp/pest v2.15.0 conflicts with phpunit/phpunit 10.5.13. - pestphp/pest v2.15.0 conflicts with phpunit/phpunit 10.5.4. - pestphp/pest v2.15.0 conflicts with phpunit/phpunit 10.5.0. - pestphp/pest v2.15.0 conflicts with phpunit/phpunit 10.4.2. - pestphp/pest v2.15.0 conflicts with phpunit/phpunit 10.3.4. - pestphp/pest v2.15.0 conflicts with phpunit/phpunit 10.3.3. - Root composer.json requires pestphp/pest v2.15 -> satisfiable by pestphp/pest[v2.15.0]. - Root composer.json requires orchestra/testbench 7.* -> satisfiable by orchestra/testbench[v7.0.0, ..., 7.x-dev].