diff --git a/build-constraints.yaml b/build-constraints.yaml
index 3e5d2a4c..ba497e2e 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3283,6 +3283,9 @@ packages:
         # https://github.com/fpco/stackage/issues/2601
         - prettyprinter-ansi-terminal < 1.1
 
+        # https://github.com/centromere/pipes-cacophony/issues/4
+        - cacophony < 0.10.0 # causes failure in pipes-cacophony
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of
@@ -3955,6 +3958,7 @@ tell-me-when-its-released:
 - cryptohash-md5-0.11.100.1 # re-enable benchmarks, https://github.com/fpco/stackage/issues/2538#issuecomment-304458844
 - cryptohash-sha1-0.11.100.1 # re-enable benchmarks, https://github.com/fpco/stackage/issues/2538#issuecomment-304458844
 - cryptohash-sha256-0.11.100.1 # re-enable benchmarks, https://github.com/fpco/stackage/issues/2538#issuecomment-304458844
+- pipes-cacophony-0.4.1 # shoulb be able to enable both this and cacophony afterwards, see https://github.com/centromere/pipes-cacophony/issues/4
 
 # Packages which should be hidden after registering, to avoid module name
 # conflicts. This is intended for at least two use cases: