Your requirements could not be resolved to an installable set of packages. Problem 1 - You can only install one version of a package, so only one of these can be installed: phpunit/phpunit[6.5.0, 6.5.1, 6.5.2, 6.5.3, 6.5.4, 6.5.5, 6.5.6, 6.5.7, 6.5.8, 6.5.9, 6.5.10, 6.5.11, 6.5.12, 6.5.13, 6.5.14, 7.5.0, 7.5.1, 7.5.2, 7.5.3, 7.5.4, 7.5.5, 7.5.6, 7.5.7, 7.5.8, 7.5.9, 7.5.10, 7.5.11, 7.5.12, 7.5.13, 7.5.14, 7.5.15, 7.5.16, 7.5.17, 7.5.18, 7.5.19, 7.5.20, 8.3.0, 8.3.1, 8.3.2, 8.3.3, 8.3.4, 8.3.5, 8.4.0, 8.4.1, 8.4.2, 8.4.3, 8.5.0, 8.5.1, 8.5.2, 8.5.3, 8.5.4, 8.5.5, 8.5.6, 8.5.7, 8.5.8, 8.5.9, 8.5.10, 8.5.11, 8.5.12, 8.5.13, 8.5.14, 8.5.15, 8.5.16, 8.5.17, 8.5.18, 8.5.19, 8.5.20, 8.5.21, 8.5.22, 8.5.23, 8.5.24, 8.5.25, 8.5.26, 8.5.27, 8.5.28, 8.5.29, 8.5.30, 8.5.31, 8.5.32, 8.5.33, 8.5.34, 8.5.35, 8.5.36, 8.5.37, 8.5.38, 9.0.0, 9.0.1, 9.0.2, 9.1.0, 9.1.1, 9.1.2, 9.1.3, 9.1.4, 9.1.5, 9.2.0, 9.2.1, 9.2.2, 9.2.3, 9.2.4, 9.2.5, 9.2.6, 9.3.0, 9.3.1, 9.3.2, 9.3.3, 9.3.4, 9.3.5, 9.3.6, 9.3.7, 9.3.8, 9.3.9, 9.3.10, 9.3.11, 9.4.0, 9.4.1, 9.4.2, 9.4.3, 9.4.4, 9.5.0, 9.5.1, 9.5.2, 9.5.3, 9.5.4, 9.5.5, 9.5.6, 9.5.7, 9.5.8, 9.5.9, 9.5.10, 9.5.11, 9.5.12, 9.5.13, 9.5.14, 9.5.16, 9.5.17, 9.5.18, 9.5.19, 9.5.20, 9.5.21, 9.5.22, 9.5.23, 9.5.24, 9.5.25, 9.5.26, 9.5.27, 9.5.28, 9.6.0, 9.6.1, 9.6.2, 9.6.3, 9.6.4, 9.6.5, 9.6.6, 9.6.7, 9.6.8, 9.6.9, 9.6.10, 9.6.11, 9.6.12, 9.6.13, 9.6.14, 9.6.15, 9.6.16, 9.6.17, 9.6.18, 9.6.19, 10.0.0, 10.0.1, 10.0.2, 10.0.3, 10.0.4, 10.0.5, 10.0.6, 10.0.7, 10.0.8, 10.0.9, 10.0.10, 10.0.11, 10.0.12, 10.0.13, 10.0.14, 10.0.15, 10.0.16, 10.0.17, 10.0.18, 10.0.19, 10.1.0, 10.1.1, 10.1.2, 10.1.3, 10.2.0, 10.2.1, 10.2.2, 10.2.3, 10.2.4, 10.2.5, 10.2.6, 10.2.7, 10.3.0, 10.3.1, 10.3.2, 10.3.3, 10.3.4, 10.3.5, 10.4.0, 10.4.1, 10.4.2, 10.5.0, 10.5.1, 10.5.2, 10.5.3, 10.5.4, 10.5.5, 10.5.6, 10.5.7, 10.5.8, 10.5.9, 10.5.10, 10.5.11, 10.5.12, 10.5.13, 10.5.14, 10.5.15, 10.5.16, 10.5.17, 10.5.18, 10.5.19, 10.5.20, 10.5.21, 10.5.22, 11.0.0, 11.0.1, 11.0.2, 11.0.3, 11.0.4, 11.0.5, 11.0.6, 11.0.7, 11.0.8, 11.0.9, 11.0.10, 11.1.0, 11.1.1, 11.1.2, 11.1.3, 11.2.0, 11.2.1, 11.2.2, 11.2.3]. - wyrihaximus/test-utilities 6.0.8 requires phpunit/phpunit ^10.5.20 -> satisfiable by phpunit/phpunit[10.5.20, 10.5.21, 10.5.22]. - wyrihaximus/async-test-utilities dev-2855c8e4d21a48ef304e86c811808369dc1ab5a5 requires phpunit/phpunit ^11.2.3 -> satisfiable by phpunit/phpunit[11.2.3]. - wyrihaximus/async-test-utilities dev-2855c8e4d21a48ef304e86c811808369dc1ab5a5 requires wyrihaximus/test-utilities ^6.0.8 -> satisfiable by wyrihaximus/test-utilities[6.0.8]. - Root composer.json requires wyrihaximus/async-test-utilities dev-2855c8e4d21a48ef304e86c811808369dc1ab5a5 -> satisfiable by wyrihaximus/async-test-utilities[dev-2855c8e4d21a48ef304e86c811808369dc1ab5a5].

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires wyrihaximus/async-test-utilities dev-230/merge, found wyrihaximus/async-test-utilities[dev-2855c8e4d21a48ef304e86c811808369dc1ab5a5] but it does not match the constraint.