Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires friendsofphp/php-cs-fixer ^2.16||^3.0 -> satisfiable by friendsofphp/php-cs-fixer[v2.16.0, ..., v2.19.3, v3.0.0, ..., v3.41.1]. - phpunit/phpunit[7.4.0, ..., 7.5.20] require php ^7.1 -> your php version (8.3.0) does not satisfy that requirement. - sebastian/diff[3.0.0, ..., 3.0.2] require php ^7.1 -> your php version (8.3.0) does not satisfy that requirement. - phpunit/phpunit[8.5.0, ..., 8.5.11] require php ^7.2 -> your php version (8.3.0) does not satisfy that requirement. - phpunit/phpunit[8.5.12, ..., 8.5.36] require sebastian/diff ^3.0.2 -> satisfiable by sebastian/diff[3.0.2, 3.0.3, 3.0.4]. - Conclusion: don't install sebastian/diff 3.0.4 (conflict analysis result) - Root composer.json requires phpunit/phpunit ~7.4||~8.5 -> satisfiable by phpunit/phpunit[7.4.0, ..., 7.5.20, 8.5.0, ..., 8.5.36].

Process completed with exit code 2.

Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires friendsofphp/php-cs-fixer ^2.16||^3.0 -> satisfiable by friendsofphp/php-cs-fixer[v2.16.0, ..., v2.19.3, v3.0.0, ..., v3.41.1]. - phpunit/phpunit[7.4.0, ..., 7.5.20] require php ^7.1 -> your php version (8.3.0) does not satisfy that requirement. - sebastian/diff[3.0.0, ..., 3.0.2] require php ^7.1 -> your php version (8.3.0) does not satisfy that requirement. - phpunit/phpunit[8.5.0, ..., 8.5.11] require php ^7.2 -> your php version (8.3.0) does not satisfy that requirement. - phpunit/phpunit[8.5.12, ..., 8.5.36] require sebastian/diff ^3.0.2 -> satisfiable by sebastian/diff[3.0.2, 3.0.3, 3.0.4]. - Conclusion: don't install sebastian/diff 3.0.4 (conflict analysis result) - Root composer.json requires phpunit/phpunit ~7.4||~8.5 -> satisfiable by phpunit/phpunit[7.4.0, ..., 7.5.20, 8.5.0, ..., 8.5.36].