For GOS 20.08 and GOS 6.0 new patch levels are available:
https://www.greenbone.net/en/roadmap-lifecycle/
GOS 6.0.14 introduces an additional safety check to prevent errors, before a switch release to GOS 20.08 can be started.
GOS 20.08.4 includes several important fixes and improvements for the Greenbone OS and the OpenVAS vulnerability scanner.
In total GOS 20.08.4 covers 17 improvements and GOS 6.0.14 covers 3 improvements. Please refer to the Roadmap & Lifecycle page for a full list of changes.