I've noticed that Hedgehog 1.6 doesn't compile with GHC 9.0.2.
If you look at the tested-with clause of the cabal file, this was actually known at the time of release (I see that this has been fixed now). Would it be possible to release a Hackage revision that prevents building with GHC 9.0? This could be done by rejecting base 4.15.1.0 (GHC 9.2 shipped with base 4.16)