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, ..., 10.5.32] but it conflicts with your root composer.json require (^11.3.3).
Problem 2
- Root composer.json requires wyrihaximus/test-utilities ^6.0.9 -> satisfiable by wyrihaximus/test-utilities[6.0.9].
- wyrihaximus/test-utilities 6.0.9 requires phpunit/phpunit ^10.5.25 -> found phpunit/phpunit[10.5.25, ..., 10.5.32] but it conflicts with your root composer.json require (^11.3.3).
Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.