Your lock file does not contain a compatible set of packages. Please run composer update. Problem 1 - mobicms/captcha is locked to version 4.0.0 and an update of this package was not requested. - mobicms/captcha 4.0.0 requires ext-gd * -> it is missing from your system. Install or enable PHP's gd extension. To enable extensions, verify that they are enabled in your .ini files: - /usr/local/etc/php/conf.d/docker-php-ext-sodium.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-gd` to temporarily ignore these required extensions.