diff --git a/build-constraints.yaml b/build-constraints.yaml
index 2af7e532..39a462af 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1135,6 +1135,9 @@ packages:
         - yesod-static-angular
         - hspec-webdriver
         - webdriver-angular
+        
+    "Sven Heyll <svh@posteo.de> @sheyll":
+        - b9
 
     "Stackage upper bounds":
         # https://github.com/fpco/stackage/issues/537