Dh + Iris not compatible when working with mods

<html>Mod 'Distant Horizons' (distanthorizons) 2.2.0-a is incompatible with version 1.7.4 or earlier of mod 'Iris' (iris), but<br>a matching version is present: 1.7.2+mc1.20.1!</html>

I have the matching version so idk what the issue is. is there some secret beta files i need or something?