Your lock file does not contain a compatible set of packages. Please run composer update. Problem 1 - laravel/horizon is locked to version v5.23.1 and an update of this package was not requested. - laravel/horizon v5.23.1 requires ext-pcntl * -> it is missing from your system. Install or enable PHP's pcntl extension. To enable extensions, verify that they are enabled in your .ini files: - /usr/local/etc/php/conf.d/docker-php-ext-intl.ini - /usr/local/etc/php/conf.d/docker-php-ext-sodium.ini - /usr/local/etc/php/conf.d/docker-php-ext-zip.ini You can also run `php --ini` in a terminal to see which files are used by PHP in CLI mode. Alternatively, you can run Composer with `--ignore-platform-req=ext-pcntl` to temporarily ignore these required extensions.