> 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/v20-en-us/parallels-ras-20-administrators-guide/ras-multi-tenant-architecture/upgrading-from-an-older-ras-version.md).

# Upgrading from an older RAS version

If you have an existing Farm running RAS v16.x and would like to join it as a Tenant to Tenant Broker, follow these steps:

1. Upgrade the Farm to RAS 17.1 (or newer).
2. To join your Farm as a Tenant to Tenant Broker, follow the instructions in the [**Deploying Tenant Broker and Tenants**](/landing/ras-admin-guide/v20-en-us/parallels-ras-20-administrators-guide/ras-multi-tenant-architecture/deploying-tenant-broker-and-tenants.md) section.
3. Once the Farm is joined, you can remove local RAS Secure Gateways if you are not planning on using them for local connections. See [**Implementation overview**](/landing/ras-admin-guide/v20-en-us/parallels-ras-20-administrators-guide/ras-multi-tenant-architecture/architecture-description/implementation-overview.md) for additional info.


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