The elementary OS team released a new ISO spin for the latest elementary OS 5.1 “Hera” operating system that includes all the recent software updates and security patches, as well as HWE (Hardware Enablement) stack updates from Ubuntu 18.04.3 LTS.

Source: LXer – elementary OS 5.1 “Hera” Has a New ISO Release Based on Ubuntu 18.04.3 LTS