Check here for detailed update on Security enhancements, Compatibility updates, Deprecated features, Improvements, Other changes, Technical evolutions, Patches and Fixes: Release 20.3.1 - Build 9228
From where I can download the Release 20.3.1 - Build 9228 RPM ?
As a hosted customer (Managed Service or Hybrid), you need to reach out to the Customer Care team to have your environment upgraded.
As an on-premise user, you can perform the upgrade. To do this, you need to download the latest stable build and upgrade all your environments.
Learn more about the upgrade process here:
Hope this helps!