diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9a67cbb5..f8de8199 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4167,7 +4167,7 @@ packages:
         - snap
         - conferer
         - conferer-snap
-        - conferer-warp
+        - conferer-warp < 0 # https://github.com/commercialhaskell/stackage/issues/6683
         - conferer-hspec
         - conferer-aeson