Your lock file does not contain a compatible set of packages. Please run composer update. Problem 1 - lorenzo/pinky is locked to version 1.1.0 and an update of this package was not requested. - lorenzo/pinky 1.1.0 requires ext-xsl * -> it is missing from your system. Install or enable PHP's xsl extension. Problem 2 - lorenzo/pinky 1.1.0 requires ext-xsl * -> it is missing from your system. Install or enable PHP's xsl extension. - twig/inky-extra v3.11.0 requires lorenzo/pinky ^1.0.5 -> satisfiable by lorenzo/pinky[1.1.0]. - twig/inky-extra is locked to version v3.11.0 and an update of this package was not requested. To enable extensions, verify that they are enabled in your .ini files: - /usr/local/etc/php/conf.d/docker-php-ext-amqp.ini - /usr/local/etc/php/conf.d/docker-php-ext-apcu.ini - /usr/local/etc/php/conf.d/docker-php-ext-bcmath.ini - /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-opcache.ini - /usr/local/etc/php/conf.d/docker-php-ext-pcntl.ini - /usr/local/etc/php/conf.d/docker-php-ext-redis.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-xsl` to temporarily ignore these required extensions.