Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires laravel/framework 9.*, found laravel/framework[v9.0.0, ..., v9.52.16] but these were not loaded, likely because it conflicts with another require. Problem 2 - orchestra/testbench is locked to version v6.24.1 and an update of this package was not requested. - orchestra/testbench v6.24.1 requires laravel/framework ^8.75 -> found laravel/framework[v8.75.0, ..., v8.83.27] but it conflicts with your root composer.json require (9.*). Problem 3 - imanghafoori/laravel-nullable[v1.2.0, ..., v1.2.2] require laravel/framework ~5.1 -> found laravel/framework[v5.1.0, ..., v5.8.38] but it conflicts with your root composer.json require (9.*). - imanghafoori/laravel-nullable v1.2.3 requires laravel/framework ~5.1|6.* -> found laravel/framework[v5.1.0, ..., v5.8.38, v6.0.0, ..., v6.20.44] but it conflicts with your root composer.json require (9.*). - imanghafoori/laravel-nullable[v1.2.4, ..., v1.2.5] require php ^7.1.3|7.2.*|7.3.*|7.4.* -> your php version (8.1.27) does not satisfy that requirement. - imanghafoori/laravel-nullable v1.2.6 requires php ^7.1.3|7.2.*|7.3.*|7.4.*|8.0.* -> your php version (8.1.27) does not satisfy that requirement. - imanghafoori/laravel-nullable v1.2.7 requires laravel/framework ~5.1|6.*|7.*|8.*|9.* -> found laravel/framework[v5.1.0, ..., v5.8.38, v6.0.0, ..., v6.20.44, v7.0.0, ..., v7.30.6, v8.0.0, ..., v8.83.27, v9.0.0, ..., v9.52.16] but these were not loaded, likely because it conflicts with another require. - imanghafoori/laravel-nullable v1.2.8 requires laravel/framework ~5.1|6.*|7.*|8.*|9.*|10.* -> found laravel/framework[v5.1.0, ..., v5.8.38, v6.0.0, ..., v6.20.44, v7.0.0, ..., v7.30.6, v8.0.0, ..., v8.83.27, v9.0.0, ..., v9.52.16, v10.0.0, ..., v10.41.0] but these were not loaded, likely because it conflicts with another require. - Root composer.json requires imanghafoori/laravel-nullable ^1.2 -> satisfiable by imanghafoori/laravel-nullable[v1.2.0, ..., v1.2.8]. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.