Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires phpstan/phpstan ^2.0, found phpstan/phpstan[2.0.0, 2.0.1] but the package is fixed to 1.12.10 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command. Problem 2 - Root composer.json requires phpstan/phpstan-deprecation-rules ^2.0, found phpstan/phpstan-deprecation-rules[2.0.0] but the package is fixed to 1.2.1 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command. Problem 3 - Root composer.json requires phpstan/phpstan-phpunit ^2.0, found phpstan/phpstan-phpunit[2.0.0, 2.0.1] but the package is fixed to 1.4.1 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command. Problem 4 - Root composer.json requires phpstan/phpstan-strict-rules ^2.0, found phpstan/phpstan-strict-rules[2.0.0] but the package is fixed to 1.6.1 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command. Problem 5 - Root composer.json requires phpstan/phpstan-symfony ^2.0, found phpstan/phpstan-symfony[2.0.0] but the package is fixed to 1.4.12 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command. Problem 6 - Root composer.json requires phpstan/phpstan-webmozart-assert ^2.0, found phpstan/phpstan-webmozart-assert[2.0.0] but the package is fixed to 1.2.11 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.