The upgrade command

The upgrade command is used to upgrade the database and perform any other necessary changes after downloading a new version of Fossilizer.

Run this command whenever you upgrade Fossilizer.

cd my-mastodon-site
fossilizer upgrade

Automatic Data Migration

Fossilizer automatically handles some data format migrations when reading from the database. For example, if you have data imported with an older version, the newer version will transparently upgrade the internal format when generating your site.

This means you generally don't need to re-import your data when upgrading Fossilizer - just run upgrade and rebuild your site.