diff --git a/build-constraints.yaml b/build-constraints.yaml
index a98a7072..5ae70b82 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4692,6 +4692,9 @@ packages:
 
         # https://github.com/commercialhaskell/stackage/issues/4633
         - hw-packed-vector < 0.1
+
+        # New http2 not supported by Warp yet
+        - http2 < 2
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of