Release: Amazon IoT Greengrass Core v2.5.1 software update on November 23, 2021 - Amazon IoT Greengrass
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Release: Amazon IoT Greengrass Core v2.5.1 software update on November 23, 2021

This release provides version 2.5.1 of the Greengrass nucleus component.

Release date: November 23, 2021

Public component updates

The following table lists Amazon-provided components that include new and updated features.


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.

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. For more information about update behavior for Amazon IoT Greengrass Core software, see Update the Amazon IoT Greengrass Core software (OTA).

Component Details
Greengrass nucleus

Version 2.5.1 of the Greengrass nucleus is available.

Bug fixes and improvements
  • Adds support for 32-bit versions of the Java Runtime Environment (JRE) on Windows.

  • Changes thing group removal behavior for core devices whose Amazon IoT policy doesn't grant the greengrass:ListThingGroupsForCoreDevice permission. With this version, the deployment continues, logs a warning, and doesn't remove components when you remove the core device from a thing group. For more information, see Deploy Amazon IoT Greengrass components to devices.

  • Fixes an issue with system environment variables that the Greengrass nucleus makes available to Greengrass component processes. You can now restart a component for it to use the latest system environment variables.