diff --git a/router/protocol.go b/router/protocol.go
index 7a6fff36..9db4160f 100644
--- a/router/protocol.go
+++ b/router/protocol.go
@@ -2,7 +2,7 @@ package router
 
 const (
 	Protocol        = "weave"
-	ProtocolVersion = 12
+	ProtocolVersion = 13
 )
 
 type ProtocolTag byte