> For the complete documentation index, see [llms.txt](https://help.security.gallagher.com/knowledge-hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.security.gallagher.com/knowledge-hub/deployment-resources/engineering-and-design-reference/migrate-and-upgrade.md).

# Upgrade and migrate

Plan and complete Command Centre migrations, software upgrades, and SQL Server updates.

Use these resources to plan a Command Centre migration or upgrade. Check compatibility before starting, then follow the relevant procedure for your server, SQL Server, and workstations.

| Topic                                                                                                                                                                                    | Description                                                                         |
| ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------- |
| [Remove unsupported hardware before upgrading](/knowledge-hub/deployment-resources/engineering-and-design-reference/migrate-and-upgrade/remove-unsupported-hardware-before-upgrading.md) | Hardware that must be removed before upgrading Command Centre                       |
| [Plan operating system upgrade paths](/knowledge-hub/deployment-resources/engineering-and-design-reference/migrate-and-upgrade/plan-operating-system-upgrade-paths.md)                   | Command Centre upgrades that require intermediate operating system versions         |
| [Migrate Command Centre to a new server](/knowledge-hub/deployment-resources/engineering-and-design-reference/migrate-and-upgrade/migrate-command-centre-to-a-new-server.md)             | Move Command Centre and update controller addressing, databases, and customizations |
| [Upgrade Command Centre Server](/knowledge-hub/deployment-resources/engineering-and-design-reference/migrate-and-upgrade/upgrade-command-centre-server.md)                               | Upgrade Command Centre through supported version steps                              |
| [Upgrade SQL Server](/knowledge-hub/deployment-resources/engineering-and-design-reference/migrate-and-upgrade/upgrade-sql-server.md)                                                     | Supported Microsoft SQL Server upgrade paths                                        |
| [Upgrade Command Centre workstations](/knowledge-hub/deployment-resources/engineering-and-design-reference/migrate-and-upgrade/upgrade-command-centre-workstations.md)                   | Upgrade ClickOnce and MSI Command Centre workstations                               |
| [Remove an SQL Server instance](/knowledge-hub/deployment-resources/engineering-and-design-reference/migrate-and-upgrade/remove-an-sql-server-instance.md)                               | Remove an unused SQL Server instance                                                |


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