Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires http-interop/http-factory-tests ^2.2.0 -> satisfiable by http-interop/http-factory-tests[2.2.0]. - http-interop/http-factory-tests 2.2.0 requires phpunit/phpunit ^10.0 || ^11.0 -> found phpunit/phpunit[10.0.0, ..., 10.5.45, 11.0.0, ..., 11.5.7] but it conflicts with your root composer.json require (^12.0.0). Problem 2 - Root composer.json requires php-http/psr7-integration-tests ^1.4.0 -> satisfiable by php-http/psr7-integration-tests[1.4.0]. - php-http/psr7-integration-tests 1.4.0 requires phpunit/phpunit ^9.3 || ^10.0 -> found phpunit/phpunit[9.3.0, ..., 9.6.22, 10.0.0, ..., 10.5.45] but it conflicts with your root composer.json require (^12.0.0). Problem 3 - Root composer.json requires phpunit/phpunit ^12.0.0 -> satisfiable by phpunit/phpunit[12.0.0, 12.0.1]. - phpunit/phpunit[12.0.0, ..., 12.0.1] require php >=8.3 -> your php version (8.2.27) does not satisfy that requirement. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.