diff --git a/build-constraints.yaml b/build-constraints.yaml
index da7711c9..87b551b9 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7344,6 +7344,9 @@ packages:
         # https://github.com/commercialhaskell/stackage/issues/6629
         - algebraic-graphs < 0.7
 
+        # https://github.com/commercialhaskell/stackage/issues/6638
+        - invariant < 0.6
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of