Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires PHP extension ext-sodium * but it is missing from your system. Install or enable PHP's sodium extension. Alternatively you can require one of these packages that provide the extension (or parts of it): Keep in mind that the suggestions are automated and may not be valid or safe to use - paragonie/sodium_compat_ext_sodium - juspay/expresscheckout-php-sdk Express Checkout SDK for PHP allows easy integration with Juspay's EC payments as a service platform - vufind/vufind A flexible discovery layer. Problem 2 - Root composer.json requires maglnet/composer-require-checker ^4.18.0 -> satisfiable by maglnet/composer-require-checker[4.18.0, 4.19.0]. - azjezz/psl[3.2.0, ..., 3.3.0] require php ~8.2.0 || ~8.3.0 || ~8.4.0 -> your php version (8.5.0) does not satisfy that requirement. - azjezz/psl 4.2.0 requires ext-sodium * -> it is missing from your system. Install or enable PHP's sodium extension. Alternatively you can require one of these packages that provide the extension (or parts of it): Keep in mind that the suggestions are automated and may not be valid or safe to use - paragonie/sodium_compat_ext_sodium - juspay/expresscheckout-php-sdk Express Checkout SDK for PHP allows easy integration with Juspay's EC payments as a service platform - vufind/vufind A flexible discovery layer. - maglnet/composer-require-checker 4.18.0 requires azjezz/psl ^3.2.0 -> satisfiable by azjezz/psl[3.2.0, 3.3.0]. - maglnet/composer-require-checker 4.19.0 requires azjezz/psl ^4.2.0 -> satisfiable by azjezz/psl[4.2.0]. To enable extensions, verify that they are enabled in your .ini files: - C:\tools\php\php.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-sodium` to temporarily ignore these required extensions.