Your lock file does not contain a compatible set of packages. Please run composer update. Problem 1 - azjezz/psl is locked to version 2.8.0 and an update of this package was not requested. - azjezz/psl 2.8.0 requires ext-bcmath * -> it is missing from your system. Install or enable PHP's bcmath extension. Problem 2 - azjezz/psl 2.8.0 requires ext-bcmath * -> it is missing from your system. Install or enable PHP's bcmath extension. - roave/backward-compatibility-check 8.4.0 requires azjezz/psl ^2.3.1 -> satisfiable by azjezz/psl[2.8.0]. - roave/backward-compatibility-check is locked to version 8.4.0 and an update of this package was not requested. To enable extensions, verify that they are enabled in your .ini files: - /etc/php/8.1/cli/php.ini - /etc/php/8.1/cli/conf.d/10-opcache.ini - /etc/php/8.1/cli/conf.d/15-xml.ini - /etc/php/8.1/cli/conf.d/20-ctype.ini - /etc/php/8.1/cli/conf.d/20-curl.ini - /etc/php/8.1/cli/conf.d/20-dom.ini - /etc/php/8.1/cli/conf.d/20-mbstring.ini - /etc/php/8.1/cli/conf.d/20-phar.ini - /etc/php/8.1/cli/conf.d/20-posix.ini - /etc/php/8.1/cli/conf.d/20-simplexml.ini - /etc/php/8.1/cli/conf.d/20-tokenizer.ini - /etc/php/8.1/cli/conf.d/20-xmlwriter.ini - /etc/php/8.1/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-bcmath` to temporarily ignore these required extensions.