# Upgrading a Primary and Secondary Cluster

Refer to [Upgrade SingleStore](https://docs.singlestore.com/db/v9.1/user-and-cluster-administration/maintain-your-cluster/upgrade-or-uninstall-singlestore/upgrade-singlestore.md) or [Upgrade to SingleStore 9.1](https://docs.singlestore.com/db/v9.1/user-and-cluster-administration/maintain-your-cluster/upgrade-or-uninstall-singlestore/upgrade-to-singlestore-9-1.md) for upgrading a primary and secondary cluster.

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Modified at: March 18, 2026

Source: [/db/v9.1/user-and-cluster-administration/high-availability-and-disaster-recovery/replicating-data-across-clusters/upgrading-a-primary-and-secondary-cluster/](https://docs.singlestore.com/db/v9.1/user-and-cluster-administration/high-availability-and-disaster-recovery/replicating-data-across-clusters/upgrading-a-primary-and-secondary-cluster/)

(An index of the documentation is available at /llms.txt)