Upgrading from Wiki.js 3.x?
Upgrade instructions are available inside each of the platforms above.
Upgrading from Wiki.js 2.x?
It is not possible to upgrade from Wiki.js 2.x yet. In-place upgrade from Wiki.js 2.x is coming at a later date (for PostgreSQL installations only). Because the development of 3.x is still undergoing major structural changes on the database side, an upgrade path will only be added once things have stabilized.
It will also be possible to load a backup made via the Wiki.js 2.x export feature in the future (including non-PostgreSQL installations).
Upgrading from Wiki.js 1.x?
A direct upgrade path from 1.x is not supported. Upgrade to Wiki.js 2.x first, then to Wiki.js 3.x.