diff --git a/Lib9c b/Lib9c
index 84f701a4d..e639502af 160000
--- a/Lib9c
+++ b/Lib9c
@@ -1 +1 @@
-Subproject commit 84f701a4d08484a619db0113017b8d71fea8c480
+Subproject commit e639502afb22df4d230d52002b519b3f8ef16b4f