> For the complete documentation index, see [llms.txt](https://docs.parallels.com/landing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.parallels.com/landing/ras-admin-guide/parallels-ras-21-administrators-guide/ras-multi-tenant-architecture/tenant-broker-compatibility-and-updates.md).

# Tenant Broker compatibility and updates

When updating Parallels RAS to a newer version, the following rules apply to the RAS Multi-Tenant architecture:

* Parallels RAS Tenant Broker supports Tenants up to two major RAS versions older. For example, if you upgrade RAS Tenant Broker from RAS 17 to RAS 18 (or the next major version when it becomes available), it will support Tenants running Parallels RAS 17.
* When doing updates, you should first update the Tenant Broker, so your RAS Multi-Tenant installation remains fully operational. You can update Tenants later during their own maintenance window.


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