Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpunit/phpunit ^4.0 || ^5.0 || ^6.0 || ^7.0, found phpunit/phpunit[4.0.0, ..., 4.8.36, 5.0.0, ..., 5.7.27, 6.0.0, ..., 6.5.14, 7.0.0, ..., 7.5.20] but these were not loaded, because they are affected by security advisories ("�]8;;https://github.com/advisories/GHSA-vvj3-c3rp-c85p�\PKSA-z3gr-8qht-p93v�]8;;�\", "�]8;;https://nvd.nist.gov/vuln/detail/CVE-2017-9841�\PKSA-w57n-mhp6-c9sd�]8;;�\"). Go to https://packagist.org/security-advisories/ to find advisory details. To ignore the advisories, add them to the audit "ignore" config. To turn the feature off entirely, you can set "block-insecure" to false in your "audit" config.