Your requirements could not be resolved to an installable set of packages.
 Problem 1
 - Root composer.json requires mockery/mockery dev-master, found mockery/mockery[dev-feature/refactor-internal-classes, dev-remove-comments-from-mock-pass, dev-feature/types, dev-mock-internals, dev-chore/add-blackfire, dev-main, dev-issue-1190/address-bc-changes-test-did-not-perform-any-assertions-error, dev-issue-1328/shouldnotreceive-is-overridden-by-invocation-count-methods, dev-feature/php82/mock-readonly-classes, 0.7.2, ..., 0.9.x-dev, 1.0.0-alpha1, ..., 1.6.x-dev, 2.0.x-dev] but it does not match the constraint. Perhaps dev-master was renamed to dev-main?

 Warning - The configuration file did not pass validation!
 The following problems have been detected:
 Line 12:
 - Element 'phpunit', attribute 'syntaxCheck': The attribute 'syntaxCheck' is not allowed.