diff --git a/keystone b/keystone
index 6d306d936a..3647671516 160000
--- a/keystone
+++ b/keystone
@@ -1 +1 @@
-Subproject commit 6d306d936a283f907a9ca89de3f8de3392bbc794
+Subproject commit 3647671516e3c9eaf5e480d4f429aaded20ffff6