Your requirements could not be resolved to an installable set of packages. Problem 1 - phpunit/phpunit[8.0.0, ..., 8.5.11] require php ^7.2 -> your php version (7.1.33) does not satisfy that requirement. - phpunit/phpunit[8.5.12, ..., 8.5.33] require php >=7.2 -> your php version (7.1.33) does not satisfy that requirement. - phpunit/phpunit[9.0.0, ..., 9.2.6] require php ^7.3 -> your php version (7.1.33) does not satisfy that requirement. - phpunit/phpunit[9.3.0, ..., 9.3.8] require php ^7.3 || ^8.0 -> your php version (7.1.33) does not satisfy that requirement. - phpunit/phpunit[9.3.9, ..., 9.6.10] require php >=7.3 -> your php version (7.1.33) does not satisfy that requirement. - phpunit/phpunit[10.0.0, ..., 10.3.1] require php >=8.1 -> your php version (7.1.33) does not satisfy that requirement. - Root composer.json requires phpunit/phpunit ^8.0 | ^9.0 | ^10.0 -> satisfiable by phpunit/phpunit[8.0.0, ..., 8.5.33, 9.0.0, ..., 9.6.10, 10.0.0, ..., 10.3.1].

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