diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7f5eb55c..868ca4cc 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5058,6 +5058,7 @@ packages:
 
       # https://github.com/commercialhaskell/stackage/issues/5667
       - profunctors < 5.6
+      - free < 5.1.6
 
       # https://github.com/commercialhaskell/stackage/issues/5666
       - generic-deriving < 1.14