diff --git a/build-constraints.yaml b/build-constraints.yaml
index ba5878f4..c73e52c8 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3640,6 +3640,9 @@ packages:
         # https://github.com/commercialhaskell/stackage/issues/3869
         - vinyl < 0.9.0
 
+        # https://github.com/commercialhaskell/stackage/issues/3876
+        - req < 1.2.0
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of