HUMAnN 3.9 provides forward compatibility to MetaPhlAn 4.1 and the Jun23 SGB database. We have not made a compatibility release yet for HUMAnN 3 and MetaPhlAn 4.2 + the Jan25 SGBs yet. I’m not 100% sure this will happen yet since we’re transitioning to HUMAnN 4 at this point, and the next version of HUMAnN 4 will be based on MetaPhlAn 4.2 + the Jan25 SGBs, so there will be less need for HUMAnN 3.x releases.