# Release: AWS IoT Greengrass Core v2.9.5 software update on March 30, 2023
<a name="greengrass-release-2023-03-30"></a>

This release provides version 2.9.5 of the Greengrass nucleus component.

**Release date:** March 30, 2023

**Topics**
+ [Public component updates](#greengrass-2023-03-30-components)

## Public component updates
<a name="greengrass-2023-03-30-components"></a>

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 2.9.5 of the [Greengrass nucleus](greengrass-nucleus-component.md) is available.<a name="changelog-nucleus-2.9.5"></a>**New features**<br />   Adds support for Greengrass nucleus software signature verification.   <br />**Bug fixes and improvements**<br />   Fixes an issue where a deployment fails when the local recipe metadata region doesn't match the Greengrass nucleus launch region. The Greengrass nucleus now renegotiates with the cloud when this happens.   Fixes an issue where the MQTT message spooler fills up and never removes messages.   Additional minor fixes and improvements.    |