diff --git a/build-constraints.yaml b/build-constraints.yaml
index 36786155..932a3174 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3263,7 +3263,7 @@ packages:
         - validation
 
     "Tony Day <tonyday567@gmail.com> @tonyday567":
-        - numhask
+        - numhask < 0.5 # https://github.com/commercialhaskell/stackage/issues/5382
         - numhask-array < 0
         - numhask-prelude < 0
         - numhask-space < 0