diff --git a/viperserver b/viperserver
index 7b4d0d1c4..21d7fef0d 160000
--- a/viperserver
+++ b/viperserver
@@ -1 +1 @@
-Subproject commit 7b4d0d1c401b985537a4a3ae502f39a8fe5ac7fa
+Subproject commit 21d7fef0dc65712453ab6e987f2f5b3dd1c6e369