diff --git a/build-constraints.yaml b/build-constraints.yaml
index b408e80d..59b98935 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3167,7 +3167,7 @@ packages:
         - one-liner < 0.9
 
         # https://github.com/fpco/stackage/issues/2507
-        - concurrent-output < 1.9
+        - concurrent-output < 1.8
 
 # end of packages