diff --git a/build-constraints.yaml b/build-constraints.yaml
index fc2a9329..2974255f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4356,7 +4356,7 @@ packages:
         - safe-coloured-text-layout-gen
         # - safe-coloured-text-parsing # missing on hackage and needed by safe-coloured-text-gen-0.0.0.4 testsuite
         - safe-coloured-text-terminfo
-        - sydtest
+        - sydtest < 0.27.2
         - sydtest-aeson
         - sydtest-amqp
         - sydtest-autodocodec