Your lock file does not contain a compatible set of packages. Please run composer update. Problem 1 - symfony/console is locked to version v5.4.43 and an update of this package was not requested. - symfony/console v5.4.43 requires symfony/polyfill-php73 ^1.9 -> could not be found in any version, there may be a typo in the package name. Problem 2 - symfony/console v5.4.43 requires symfony/polyfill-php73 ^1.9 -> could not be found in any version, there may be a typo in the package name. - ondrejmirtes/simple-downgrader 2.x-dev requires symfony/console ^5.4 -> satisfiable by symfony/console[v5.4.43]. - ondrejmirtes/simple-downgrader is locked to version 2.x-dev and an update of this package was not requested. Potential causes: - A typo in the package name - The package is not available in a stable-enough version according to your minimum-stability setting see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details. - It's a private package and you forgot to add a custom repository to find it Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.