Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^11.3.5 -> satisfiable by phpunit/phpunit[11.3.5]. - phpunit/phpunit 11.3.5 requires php >=8.2 -> your php version (8.1.29) does not satisfy that requirement. Problem 2 - orchestra/testbench v4.0.0 requires phpunit/phpunit ^8.0 -> found phpunit/phpunit[8.0.0, ..., 8.5.39] but it conflicts with your root composer.json require (^11.3.5). - orchestra/testbench[v4.0.1, ..., v4.4.1] require phpunit/phpunit ^8.3 -> found phpunit/phpunit[8.3.0, ..., 8.5.39] but it conflicts with your root composer.json require (^11.3.5). - orchestra/testbench[v4.5.0, ..., v4.15.0] require phpunit/phpunit ^8.3 || ^9.0 -> found phpunit/phpunit[8.3.0, ..., 8.5.39, 9.0.0, ..., 9.6.20] but it conflicts with your root composer.json require (^11.3.5). - orchestra/testbench[v4.16.0, ..., v4.18.0] require phpunit/phpunit ^7.5.15 || ^8.4 || ^9.3.3 -> found phpunit/phpunit[7.5.15, ..., 7.5.20, 8.4.0, ..., 8.5.39, 9.3.3, ..., 9.6.20] but it conflicts with your root composer.json require (^11.3.5). - orchestra/testbench[v5.0.0, ..., v5.17.1, v6.0.0, ..., v6.9.0] require phpunit/phpunit ^8.4 || ^9.0 -> found phpunit/phpunit[8.4.0, ..., 8.5.39, 9.0.0, ..., 9.6.20] but it conflicts with your root composer.json require (^11.3.5). - orchestra/testbench[v5.18.0, ..., v5.20.0, v6.13.0, ..., v6.21.1] require phpunit/phpunit ^8.4 || ^9.3.3 -> found phpunit/phpunit[8.4.0, ..., 8.5.39, 9.3.3, ..., 9.6.20] but it conflicts with your root composer.json require (^11.3.5). - orchestra/testbench[v6.10.0, ..., v6.12.1] require phpunit/phpunit ^8.4 || ^9.3 -> found phpunit/phpunit[8.4.0, ..., 8.5.39, 9.3.0, ..., 9.6.20] but it conflicts with your root composer.json require (^11.3.5). - orchestra/testbench[v6.22.0, ..., v6.46.0] require phpunit/phpunit ^8.5.21 || ^9.5.10 -> found phpunit/phpunit[8.5.21, ..., 8.5.39, 9.5.10, ..., 9.6.20] but it conflicts with your root composer.json require (^11.3.5). - orchestra/testbench[v7.0.0, ..., v7.45.0] require phpunit/phpunit ^9.5.10 -> found phpunit/phpunit[9.5.10, ..., 9.6.20] but it conflicts with your root composer.json require (^11.3.5). - orchestra/testbench[v8.0.0, ..., v8.3.1] require phpunit/phpunit ^9.6 || ^10.0.7 -> found phpunit/phpunit[9.6.0, ..., 9.6.20, 10.0.7, ..., 10.5.34] but it conflicts with your root composer.json require (^11.3.5). - orchestra/testbench[v8.4.0, ..., v8.26.0] require phpunit/phpunit ^9.6 || ^10.1 -> found phpunit/phpunit[9.6.0, ..., 9.6.20, 10.1.0, ..., 10.5.34] but it conflicts with your root composer.json require (^11.3.5). - orchestra/testbench[v9.0.0, ..., v9.4.0] require php ^8.2 -> your php version (8.1.29) does not satisfy that requirement. - Root composer.json requires orchestra/testbench ^4.0|^5.0|^6.0|^7.0|^8.0|^9.0 -> satisfiable by orchestra/testbench[v4.0.0, ..., v4.18.0, v5.0.0, ..., v5.20.0, v6.0.0, ..., v6.46.0, v7.0.0, ..., v7.45.0, v8.0.0, ..., v8.26.0, v9.0.0, ..., v9.4.0].