# Upgrade Trilio

Starting Trilio for Openstack 4.0 does Trilio for Openstack allow in-place upgrades.

The following versions can be upgraded to each other:

| Old             | New               |
| --------------- | ----------------- |
| 4.0 GA (4.0.92) | 4.0 SP1 (4.0.115) |
| 4.0 GA (4.0.92) | 4.1 latest hotfix |
| 4.0 GA (4.0.92) | 4.2 GA (4.2.64)   |
| 4.1 GA (4.1.94) | 4.1 latest Hotfix |
| 4.1 Hotfix      | 4.1 latest Hotfix |
| 4.1 GA (4.1.94) | 4.2 GA (4.2.64)   |
| 4.1 Hotfix      | 4.2 GA (4.2.64)   |

The upgrade process contains upgrading the Trilio appliance and the Openstack components and is dependent on the underlying operating system.

{% hint style="warning" %}
The Upgrade of Trilio for Canonical Openstack is managed through the charms.
{% endhint %}

## Enable mount-bind for NFS

T4O 4.2 has changed the calculation of the mount point.\
It is necessary to set up the mount-bind to make T4O 4.1 or older backups available for T4O 4.2

Please follow [this documentation](https://docs.trilio.io/openstack/tvo-4.2/deployment/enabling-tvo-4.1-or-older-backups-when-using-nfs-backup-target) to set up the mount bind for Canonical OpenStack.