# Release: AWS IoT Greengrass Core v2.5.0 software update on November 12, 2021
AWS IoT Greengrass Core v2.5.0 software updateAWS IoT Greengrass Core v2.5.0 software update[https://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2021-11-12.html](https://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2021-11-12.html)

This release provides version 2.5.0 of the Greengrass nucleus component and updates AWS-provided components. It includes support for running the AWS IoT Greengrass Core software on Windows devices. It also changes the thing group removal behavior and adds support for HTTPS proxies.

This release provides version 2.5.0 of the Greengrass nucleus component, new AWS-provided components, and updates to AWS-provided components.

**Release date:** November 12, 2021

**Release highlights**
+ **Windows device support**—You can now run the AWS IoT Greengrass Core software on devices running Windows operating systems. For more information, see [Greengrass feature compatibility](operating-system-feature-support-matrix.md).
+ **New thing group removal behavior**—You can now remove a core device from a thing group to remove that thing group's components in the next deployment to that device.
**Important**  
<a name="greengrass-nucleus-v2.5.0-thing-group-removal-permission-requirement"></a>As a result of this change, a core device's AWS IoT policy must have the `greengrass:ListThingGroupsForCoreDevice` permission. If you used the [AWS IoT Greengrass Core software installer to provision resources](quick-installation.md), the default AWS IoT policy allows `greengrass:*`, which includes this permission. For more information, see [Device authentication and authorization for AWS IoT Greengrass](device-auth.md).
+ **Hardware security support**—You can now configure the AWS IoT Greengrass Core software to use a hardware security module (HSM), so you can securely store the device's private key and certificate. For more information, see [Hardware security integration](hardware-security.md).
+ **HTTPS proxy support**—You can now configure the AWS IoT Greengrass Core software to connect through HTTPS proxies. For more information, see [Connect on port 443 or through a network proxy](configure-greengrass-core-v2.md#configure-alpn-network-proxy).

**Topics**
+ [

## Platform support updates
](#greengrass-2021-11-12-platforms)
+ [

## Public component updates
](#greengrass-2021-11-12-components)

## Platform support updates



| **Platform** | **Details** | 
| --- | --- | 
| Windows |  AWS IoT Greengrass now supports running the AWS IoT Greengrass Core software on the following versions of Windows: [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2021-11-12.html) For more information, see [Greengrass feature compatibility](operating-system-feature-support-matrix.md). | 

## Public component updates


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 2.5.0 of the [Greengrass nucleus](greengrass-nucleus-component.md) is available. <a name="changelog-nucleus-2.5.0"></a>[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2021-11-12.html)  | 
| Greengrass CLI |  Version 2.5.0 of the [Greengrass CLI](greengrass-cli-component.md) is available. <a name="changelog-greengrass-cli-2.5.0"></a>[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2021-11-12.html)  | 
| CloudWatch metrics |  Version 3.0.0 of the [CloudWatch metrics](cloudwatch-metrics-component.md) component is available. <a name="changelog-cloudwatch-metrics-3.0.0-major-version-changes"></a>This version of the CloudWatch metrics component expects different configuration parameters than version 2.x. If you use a non-default configuration for version 2.x, and you want to upgrade from v2.x to v3.x, you must update the component's configuration. For more information, see [CloudWatch metrics component configuration](cloudwatch-metrics-component.md#cloudwatch-metrics-component-configuration). <a name="changelog-cloudwatch-metrics-3.0.0"></a>[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2021-11-12.html)  | 
| Lambda manager |  Version 2.2.0 of the [Lambda manager](lambda-manager-component.md) component is available. <a name="changelog-lambda-manager-2.2.0"></a>[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/greengrass-release-2021-11-12.html)  |