Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires wyrihaximus/react-phpunit-run-tests-in-fiber ^2.0.0 -> satisfiable by wyrihaximus/react-phpunit-run-tests-in-fiber[2.0.0]. - wyrihaximus/react-phpunit-run-tests-in-fiber 2.0.0 requires phpunit/phpunit ^10.5 -> found phpunit/phpunit[10.5.0, ..., 10.5.38] but it conflicts with your root composer.json require (^11.5.0). Problem 2 - Root composer.json requires wyrihaximus/test-utilities ^6.0.9 -> satisfiable by wyrihaximus/test-utilities[6.0.9, 6.0.10]. - wyrihaximus/test-utilities 6.0.10 requires phpunit/phpunit ^10.5.32 -> found phpunit/phpunit[10.5.32, ..., 10.5.38] but it conflicts with your root composer.json require (^11.5.0). - wyrihaximus/test-utilities 6.0.9 requires phpunit/phpunit ^10.5.25 -> found phpunit/phpunit[10.5.25, ..., 10.5.38] but it conflicts with your root composer.json require (^11.5.0). Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.