# Release: AWS IoT Greengrass Core v2.9.0 software update on November 15, 2022
<a name="greengrass-release-2022-11-15"></a>

This release provides version 2.9.0 of the Greengrass nucleus component and updates to AWS-provided components.

**Release date:** November 15, 2022

**Release highlights**
+ **Offline authentication** – AWS IoT Greengrass now supports offline authentication. You can configure your AWS IoT Greengrass core device so that client devices can connect to a core device, even when the core device isn't connected to the cloud. For more information, see [Offline authentication](https://docs.aws.amazon.com/greengrass/v2/developerguide/offline-authentication.html).
+ **Subdeployments** – You can now create subdeployments. You can use a subdeployment to resolve unsuccessful deployments. Each subdeployment can test a different configuration of an unsuccessful deployment on a smaller subset of devices. For more information, see [Create subdeployments](https://docs.aws.amazon.com/greengrass/v2/developerguide/create-subdeployments.html).

**Topics**
+ [Public component updates](#greengrass-2022-11-15-components)

## Public component updates
<a name="greengrass-2022-11-15-components"></a>

The following table lists AWS-provided components that include new and updated features.

**Important**  <a name="component-patch-update-note"></a>
<a name="component-patch-update"></a>When you deploy a component, AWS IoT Greengrass installs the latest supported versions of all of that component's dependencies. Because of this, new patch versions of AWS-provided public components might be automatically deployed to your core devices if you add new devices to a thing group, or you update the deployment that targets those devices. Some automatic updates, such as a nucleus update, can cause your devices to restart unexpectedly.   
<a name="component-version-pinning"></a>To prevent unintended updates for a component that is running on your device, we recommend that you directly include your preferred version of that component when you [create a deployment](create-deployments.md). For more information about update behavior for AWS IoT Greengrass Core software, see [Update the AWS IoT Greengrass Core software (OTA)](update-greengrass-core-v2.md).


| **Component** | **Details** | 
| --- | --- | 
| Greengrass nucleus |  Version 2.9.0 of the [Greengrass nucleus](greengrass-nucleus-component.md) is available. <a name="changelog-nucleus-2.9.0"></a>[See the AWS documentation website for more details](http://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2022-11-15.html)  | 
| Client device auth |  Version 2.3.0 of the [client device auth component](client-device-auth-component.md) is available. <a name="changelog-client-device-auth-2.3.0"></a>[See the AWS documentation website for more details](http://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2022-11-15.html)  | 
| MQTT 5 broker (EMQX) |  Version 1.2.0 of the [MQTT 5 broker (EMQX)](mqtt-broker-emqx-component.md) component is available. <a name="changelog-emqx-1.2.0"></a>[See the AWS documentation website for more details](http://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2022-11-15.html)  | 
| Moquette MQTT broker |  Version 2.3.0 of the new [Moquette MQTT broker component](mqtt-broker-moquette-component.md) is available. <a name="changelog-moquette-2.3.0"></a>[See the AWS documentation website for more details](http://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2022-11-15.html)  | 
| Secret manager |  Version 2.1.4 of the new [secret manager](secret-manager-component.md) is available. <a name="changelog-secret-manager-2.3.0"></a>[See the AWS documentation website for more details](http://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2022-11-15.html)  | 
| Stream manager |  Version 2.1.2 of the new [stream manager](stream-manager-component.md) is available. <a name="changelog-stream-manager-2.1.2"></a>[See the AWS documentation website for more details](http://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2022-11-15.html)  |