diff --git a/build-constraints.yaml b/build-constraints.yaml
index d9114e62..4715a7ba 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -208,7 +208,7 @@ packages:
         - butter < 0 # MonadFail
 
     "Iris Ward <aditu.venyhandottir@gmail.com> @AdituV":
-        - typenums
+        - typenums < 0 # ghc 8.10.1 https://github.com/commercialhaskell/stackage/issues/5450
 
     "Jude Taylor <me@jude.xyz> @pikajude":
         - th-printf