---
title: "8.4.x, 8.5.x, and 8.6.x to 9.0.6 Upgrade Procedure"
canonical: "https://docs.infoblox.com/space/niosupgrade/1320419834/8.4.x%2C%208.5.x%2C%20and%208.6.x%20to%209.0.6%20Upgrade%20Procedure"
format: markdown
---
To upgrade from NIOS 8.4.x, 8.5.x, or 8.6.x to 9.0.6, perform the following steps:

1. Apply the NIOS-98022 hotfix. For more information, see [https://support.infoblox.com/s/article/How-to-recover-NIOS-from-old-certificate-related-issues](https://support.infoblox.com/s/article/How-to-recover-NIOS-from-old-certificate-related-issues)
2. [Download the new upgrade software.](https://infoblox-docs.atlassian.net/wiki/spaces/niosupgrade/pages/1320387375)
3. [Upload the upgrade software to the Grid Master](https://infoblox-docs.atlassian.net/wiki/spaces/niosupgrade/pages/1321042405).
4. [Distribute the software upgrade files](https://infoblox-docs.atlassian.net/wiki/spaces/niosupgrade/pages/1320354556).
5. [Test the upgrade](https://infoblox-docs.atlassian.net/wiki/spaces/niosupgrade/pages/1320420107).
6. [Perform the actual upgrade](https://infoblox-docs.atlassian.net/wiki/spaces/niosupgrade/pages/1320354587).