diff --git a/keystone b/keystone
index 5f966b28a5..ac9eb9cac3 160000
--- a/keystone
+++ b/keystone
@@ -1 +1 @@
-Subproject commit 5f966b28a5e1a12caf7ee2f34b56c91e53f4a5d3
+Subproject commit ac9eb9cac3ec97b6287bc17431f1ebbfce362232