diff --git a/build-constraints.yaml b/build-constraints.yaml
index 72bf6b6b..709f259d 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3267,6 +3267,7 @@ packages:
 
         # https://github.com/fpco/stackage/issues/3234
         - free < 5
+        - ChannelT < 0.0.0.7
 
         # https://github.com/fpco/stackage/issues/3237
         - hpack < 0.23