Your requirements could not be resolved to an installable set of packages. Problem 1 - craftcms/cms[4.0.0-alpha.1, ..., 4.7.1, 5.0.0-alpha.1, ..., 5.0.0-alpha.10] require ext-bcmath * -> it is missing from your system. Install or enable PHP's bcmath extension. - Root composer.json requires craftcms/cms ^4.0.0 || ^5.0.0-alpha.1 -> satisfiable by craftcms/cms[4.0.0-alpha.1, ..., 4.7.1, 5.0.0-alpha.1, ..., 5.0.0-alpha.10]. 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-bcmath` to temporarily ignore these required extensions.