diff --git a/build-constraints.yaml b/build-constraints.yaml
index baa974ba..00d3a4bc 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2730,6 +2730,7 @@ packages:
         - cryptonite < 0.21
         - memory < 0.14
         - tls < 1.3.9
+        - cacophony < 0.9.0
 
         # https://github.com/fpco/stackage/issues/2148
         - rattletrap < 2.1.0