# Release: Greengrass nucleus lite v2.5.1 software update on May 6, 2026
<a name="greengrass-release-2026-05-06-2.5.1"></a>

This release provides version 2.5.1 of the Greengrass nucleus lite component.

**Release date:** May 6, 2026

**Topics**
+ [Public component updates](#greengrass-2026-05-06-2.5.1-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 lite](greengrass-nucleus-lite-component.md)<br />Version 2.5.1 | <a name="changelog-nucleus-lite-2.5.1"></a> **Bug fixes and improvements**<br />   Fixes an issue where `SubscribeToConfigurationUpdate` could notify subscribers when a configuration value did not actually change.   Fixes an issue where the deployment source ARN of components could be overwritten by unrelated deployments.   Fixes an issue where HTTP artifact download retries did not trigger on retryable error codes such as 5xx and 429.     |