diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7495ea5f..0dd8a6f0 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2753,6 +2753,9 @@ packages:
 
         # https://github.com/fpco/stackage/issues/2195
         - Unique < 0.4.6
+
+        # https://github.com/fpco/stackage/issues/2196
+        - req < 0.2.0
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of