Hi! Could you please backport the new version of lithium to 1.21? I was hoping that this would be possible just by changing fabric.mod.json but it breaks the game. For some reason, I can't update to 1.21.1. At the same time, mods like Carpet TIS or Async don't work with the old lithium.

I'm sorry if I'm asking for something too much.

Until 2No2Name decides what to do here, you can do a dependency override: https://wiki.fabricmc.net/tutorial:dependency_overrides

I recommend switching to 1.21.1 and then creating a dep override for any 1.21 dependent mods

Nearly every mod-- if not all of them-- which are compatible with Minecraft 1.21 will also be compatible with Minecraft 1.21.1, since only a few lines of code were changed between those versions.

As mentioned, you should use a dependency override to patch mods that expect Minecraft 1.21, rather than ask every other mod author to needlessly publish a separate version of their mod.