Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires gabrielelana/byte-units ^0.5.0 -> satisfiable by gabrielelana/byte-units[0.5.0]. - gabrielelana/byte-units 0.5.0 requires ext-bcmath * -> it is missing from your system. Install or enable PHP's bcmath extension. Alternatively you can require one of these packages that provide the extension (or parts of it): - phpseclib/bcmath_compat PHP 5.x-8.x polyfill for bcmath extension - lumisys/bcmath_compat PHP 5.x/7.x polyfill for bcmath extension To enable extensions, verify that they are enabled in your .ini files: - /usr/local/etc/php/php.ini - /usr/local/etc/php/conf.d/docker-php-ext-opcache.ini - /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.