diff --git a/build-constraints.yaml b/build-constraints.yaml
index c7dedcc2..fb40f6ef 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3177,6 +3177,7 @@ packages:
 
         # https://github.com/fpco/stackage/issues/2451
         - websockets < 0.11.0.0
+        - servant-subscriber < 0.6.0.1 # requires 0.11 on websockets
 
         # https://github.com/fpco/stackage/issues/2464
         - traverse-with-class < 1.0.0.0