# Release: Amazon IoT Greengrass Core v2.5.0 software update on November 12, 2021
<a name="greengrass-release-2021-11-12"></a>

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

**Release date:** November 12, 2021

**Release highlights**
+ **Windows device support**—You can now run the Amazon 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 Amazon IoT policy must have the `greengrass:ListThingGroupsForCoreDevice` permission. If you used the [Amazon IoT Greengrass Core software installer to provision resources](quick-installation.md), the default Amazon IoT policy allows `greengrass:*`, which includes this permission. For more information, see [Device authentication and authorization for Amazon IoT Greengrass](device-auth.md).
+ **Hardware security support**—You can now configure the Amazon 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 Amazon 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
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| **Platform** | **Details** | 
| --- | --- | 
| Windows | Amazon IoT Greengrass now supports running the Amazon IoT Greengrass Core software on the following versions of Windows:[See the AWS documentation website for more details](http://docs.amazonaws.cn/en_us/greengrass/v2/developerguide/greengrass-release-2021-11-12.html)<br />For more information, see [Greengrass feature compatibility](operating-system-feature-support-matrix.md). | 

## Public component updates
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The following table lists Amazon-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, Amazon IoT Greengrass installs the latest supported versions of all of that component's dependencies. Because of this, new patch versions of Amazon-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 Amazon IoT Greengrass Core software, see [Update the Amazon 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.amazonaws.cn/en_us/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.amazonaws.cn/en_us/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.<br /><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.amazonaws.cn/en_us/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.amazonaws.cn/en_us/greengrass/v2/developerguide/greengrass-release-2021-11-12.html) |