# PHP Package Dependencies
Craft Commerce uses the following PHP packages, which will be installed for you via Composer. See each package’s documentation for any additional requirements.
- craftcms/cms (opens new window) ^4.0.0-beta.1
- dompdf/dompdf (opens new window) ^1.0.2 (recommends GD and IMagick)
- ibericode/vat (opens new window) ^1.1.2
- iio/libmergepdf (opens new window) ^4.0
If you’re using MySQL or MariaDB, the engine should provide timezone support for the best experience. See Populating MySQL and MariaDB Timezone Tables (opens new window).