Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires laravel/tinker 2.10.1 (exact version match: 2.10.1 or 2.10.1.0), found laravel/tinker[v2.10.1] but the package is fixed to v2.7.0 (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.