> For the complete documentation index, see [llms.txt](https://docs.trilio.io/openstack/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.trilio.io/openstack/t4o-5.x/upgrading-to-t4o-5.x-from-older-supported-versions/upgrade-triliovault.md).

# Supported Trilio Upgrade Path

The following versions can be upgraded to each other:

| From                                        | To            |
| ------------------------------------------- | ------------- |
| 4.1 GA (4.1.94) or 4.1.HF**x**              | 5.**x**.**x** |
| 4.2 GA (4.2.64) or 4.2.HF**x** or 4.2.**x** | 5.**x**.**x** |

The upgrade process involves upgrading the Trilio appliance and the OpenStack components and is dependent on the underlying operating system till T4O 4.2 release.

{% hint style="info" %}
From the **T4O 5.0** release, the Trilio appliance is deprecated and all the WLM services are containerized and will be deployed on OpenStack itself.
{% endhint %}