Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires spatie/phpunit-snapshot-assertions ^5.0 -> satisfiable by spatie/phpunit-snapshot-assertions[5.0.0, ..., 5.1.7]. - Root composer.json requires vimeo/psalm ~4.30.0 -> satisfiable by vimeo/psalm[4.30.0]. - sebastian/diff[3.0.0, ..., 3.0.2] require php ^7.1 -> your php version (8.2.27) does not satisfy that requirement. - sebastian/diff 4.0.1 requires php ^7.3 -> your php version (8.2.27) does not satisfy that requirement. - vimeo/psalm 4.30.0 requires sebastian/diff ^3.0 || ^4.0 -> satisfiable by sebastian/diff[3.0.0, ..., 3.0.x-dev, 4.0.0, ..., 4.0.x-dev]. - Conclusion: install sebastian/diff 5.1.1 (conflict analysis result) - You can only install one version of a package, so only one of these can be installed: sebastian/diff[1.1.0, ..., 1.4.x-dev, 2.0.1, 2.0.x-dev, 3.0.0, ..., 3.0.x-dev, 4.0.1, ..., 4.0.x-dev, 5.0.0, ..., 5.1.x-dev, 6.0.0, 6.0.1, 6.0.2, 6.0.x-dev, 7.0.0, 7.0.x-dev].