Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires php-cs-fixer/shim 3.64.0 (exact version match: 3.64.0 or 3.64.0.0), found php-cs-fixer/shim[v3.64.0] but the package is fixed to v3.61.1 (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. Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.