diff --git a/build-constraints.yaml b/build-constraints.yaml
index 14fe471e..47513498 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2003,7 +2003,7 @@ packages:
 
         # https://github.com/fpco/stackage/issues/1238
         - path-io < 1.0.0
-        - plan-b < 0.2.0
+        - plan-b < 0.1.1
 
         # https://github.com/fpco/stackage/issues/1240
         - cryptohash < 0.11.7