> For the complete documentation index, see [llms.txt](https://docs.cybus.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cybus.io/2-6-1/deployment/upgrading-connectware/on-docker/to-2-0-5-on-docker.md).

# Upgrading Connectware to 2.0.5 (Docker)

How to upgrade Connectware to version 2.0.5 on Docker.

Connectware 2.0.5 brings significant improvements to OPC UA reliability and CybusMQ performance, reducing message loss and improving system stability under load. For more information, see [What has changed in 2.0.5](https://docs.cybus.io/2-6-1/deployment/upgrading-connectware/on-docker/pages/veQnb7pmTbxcaG8seqYD#connectware-2.0.5).

This upgrade requires you to delete the data volumes that store the metadata of CybusMQ.

{% hint style="warning" %}

## Check your upgrade path

This upgrade is one step of a longer upgrade path. Before you continue, check [Connectware Upgrade Paths](/2-6-1/deployment/upgrading-connectware/upgrade-paths.md) to determine which steps apply to your installation.
{% endhint %}

## Important Notes

This upgrade will delete all persisted data of the Connectware broker. This includes client sessions, subscriptions, and retained data. If your configuration relies on any type of data persisted by the broker, make sure to properly initialize your applications after the upgrade.

If you rely on persisted data, create a backup or snapshot of the broker data volumes. This allows you to roll back in case of complications.

## Upgrading Procedure

{% hint style="warning" %}
If your installation is older than 2.0.2, first complete the [upgrade to 2.0.2](/2-6-1/deployment/upgrading-connectware/on-docker/to-2-0-2-on-docker.md) before upgrading to 2.0.5.
{% endhint %}

1. Delete the broker data volume of Connectware. For more information, see [Deleting Broker Data Volumes on Docker Compose](/2-6-1/broker/cybusmq/operations/deleting-broker-data-volumes.md#deleting-broker-data-volumes-on-docker-compose).
2. Download and install Connectware 2.0.5. For more information, see [Upgrading Connectware (Docker)](/2-6-1/deployment/upgrading-connectware/on-docker.md).


---

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