diff --git a/build-constraints.yaml b/build-constraints.yaml
index e4f89988..3ad975f6 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3426,7 +3426,7 @@ packages:
         - Glob < 0.9.0
 
         # https://github.com/fpco/stackage/issues/2920
-        - reducers < 3.12.1
+        - fingertree < 0.1.2
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of