Your lock file does not contain a compatible set of packages. Please run composer update. Problem 1 - symfony/polyfill-mbstring is locked to version v1.32.0 and an update of this package was not requested. - symfony/polyfill-mbstring v1.32.0 requires ext-iconv * -> it is missing from your system. Install or enable PHP's iconv extension. Problem 2 - friendsofphp/php-cs-fixer is locked to version v3.82.2 and an update of this package was not requested. - friendsofphp/php-cs-fixer v3.82.2 requires symfony/polyfill-mbstring ^1.32 -> satisfiable by symfony/polyfill-mbstring[v1.32.0]. - symfony/polyfill-mbstring v1.32.0 requires ext-iconv * -> it is missing from your system. Install or enable PHP's iconv extension. To enable extensions, verify that they are enabled in your .ini files: - /etc/php/7.4/cli/php.ini - /etc/php/7.4/cli/conf.d/15-xml.ini - /etc/php/7.4/cli/conf.d/20-ctype.ini - /etc/php/7.4/cli/conf.d/20-curl.ini - /etc/php/7.4/cli/conf.d/20-dom.ini - /etc/php/7.4/cli/conf.d/20-json.ini - /etc/php/7.4/cli/conf.d/20-mbstring.ini - /etc/php/7.4/cli/conf.d/20-phar.ini - /etc/php/7.4/cli/conf.d/20-simplexml.ini - /etc/php/7.4/cli/conf.d/20-tokenizer.ini - /etc/php/7.4/cli/conf.d/20-xdebug.ini - /etc/php/7.4/cli/conf.d/20-xmlwriter.ini - /etc/php/7.4/cli/conf.d/99-pecl.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-iconv` to temporarily ignore these required extensions.