kismet stable was missing support for a few channels which are widely used and refusing to set them. this release was made to support dfs2 channels as well as prevent memory leakage when running a drone.

You can find commits here:
https://kismetwireless.net/gitweb/?p=kismet.git;a=log;h=refs/heads/Kismet-Stable

This is not a major update, but not being able to monitor dfs2 channels certainly seems important given how prevalent their use is.