Release: Amazon IoT Greengrass Core v2.5.2 software update on December 3, 2021 - Amazon IoT Greengrass
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Release: Amazon IoT Greengrass Core v2.5.2 software update on December 3, 2021

This release provides version 2.5.2 of the Greengrass nucleus component.

Release date: December 3, 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 2.5.2 of the Greengrass nucleus is available.

Bug fixes and improvements
  • Fixes an issue where after the Greengrass nucleus updates, the Windows service fails to start again after you stop it or reboot the device.

Amazon IoT Device Defender

Version 3.0.1 of the Amazon IoT Device Defender component is available.

This version of the Amazon IoT Device Defender 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 Amazon IoT Device Defender component configuration.

New features
  • Adds support for core devices that run Windows.

  • Changes the component type from Lambda component to generic component. This component now no longer depends on the legacy subscription router component to create subscriptions.

  • Adds the new UseInstaller configuration parameter that lets you optionally disable the installation script that installs component dependencies.