diff --git a/build-constraints.yaml b/build-constraints.yaml
index b501f116..8c7ee59f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1109,9 +1109,6 @@ packages:
         - machines < 0.5
         - free < 4.12
 
-        # https://github.com/fpco/stackage/issues/591
-        - th-orphans < 0.12
-
         # https://github.com/fpco/stackage/issues/602
         - errors < 2