diff --git a/upstream b/upstream
index 6dd6c5b..a4c9247 160000
--- a/upstream
+++ b/upstream
@@ -1 +1 @@
-Subproject commit 6dd6c5b523b11a1316f7c161217bd7b97cdb8b39
+Subproject commit a4c9247a1ad1cac7ea7739de9b5c189005a68c12