The following guides will help you upgrade your project or module to Silverstripe CMS 4. Upgrading a module is very similar to upgrading a Project. The module upgrade guide assumes familiarity with the project upgrade guide.

Upgrading to Silverstripe CMS 4
Upgrade your project Silverstripe CMS 4 and keep it up to date with the latest fixes, security patches and new features.
Upgrading a module
Upgrade your module to be compatible with Silverstripe CMS 4 and make it easy for your users to upgrade.