diff --git a/bound.cabal b/bound.cabal
index a9e31f2..5589a0a 100644
--- a/bound.cabal
+++ b/bound.cabal
@@ -95,7 +95,7 @@ library
     cereal           >= 0.3.5.2 && < 0.6,
     comonad          >= 3       && < 6,
     hashable         >= 1.2.5.0 && < 1.3,
-    mmorph           >= 1.0     && < 1.1,
+    mmorph           >= 1.0     && < 1.2,
     deepseq          >= 1.1     && < 1.5,
     profunctors      >= 3.3     && < 6,
     template-haskell >= 2.7     && < 3,