# Release: AWS IoT Greengrass Core v2.12.0 software update on November 7, 2023
<a name="greengrass-release-2023-11-07"></a>

This release provides version 2.12.0 of the Greengrass nucleus component and updates to AWS-provided components.

**Release date:** November 7, 2023

**Release highlights**
+ **Bootstrap on rollback** – AWS IoT Greengrass now provides a Greengrass nucleus configuration parameter called `BootstrapOnRollback`. This feature enables you to run the bootstrap lifecycle steps as part of a rollback deployment.

**Topics**
+ [Public component updates](#greengrass-2023-11-07-components)

## Public component updates
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The following table lists components provided by AWS 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 2.12.0 of the [Greengrass nucleus](greengrass-nucleus-component.md) is available.<a name="changelog-nucleus-2.12.0"></a>[See the AWS documentation website for more details](http://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2023-11-07.html) |