diff --git a/lib/ping-protocol b/lib/ping-protocol
index ef8e5a8..ac67fcb 160000
--- a/lib/ping-protocol
+++ b/lib/ping-protocol
@@ -1 +1 @@
-Subproject commit ef8e5a852606d2a401a46ce1aad6bcf2799c6bf6
+Subproject commit ac67fcb72ae22cf9cec2fa2fe1a3061b947b72d0