diff --git a/build-constraints.yaml b/build-constraints.yaml
index 1f7ed008..596f9f5d 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4695,6 +4695,10 @@ packages:
 
         # New http2 not supported by Warp yet
         - http2 < 2
+
+        # https://github.com/commercialhaskell/stackage/issues/4645 but see
+        # also http2 < 2 bound above
+        - warp < 3.3.0
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of