Your requirements could not be resolved to an installable set of packages. Problem 1 - sylius/sylius[v1.12.0, ..., v1.12.13] require ext-exif * -> it is missing from your system. Install or enable PHP's exif extension. - Root composer.json requires sylius/sylius ^1.12 -> satisfiable by sylius/sylius[v1.12.0, ..., v1.12.13]. To enable extensions, verify that they are enabled in your .ini files: - /usr/local/etc/php/conf.d/docker-php-ext-gd.ini - /usr/local/etc/php/conf.d/docker-php-ext-intl.ini - /usr/local/etc/php/conf.d/docker-php-ext-pdo_mysql.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-exif` to temporarily ignore these required extensions.