diff --git a/peer.go b/peer.go
index a93d22d93a..e11ac0a570 100644
--- a/peer.go
+++ b/peer.go
@@ -21,7 +21,7 @@ const (
 	// The size of the output buffer for writing messages
 	outputBufferSize = 50
 	// Current protocol version
-	ProtocolVersion = 21
+	ProtocolVersion = 22
 	// Interval for ping/pong message
 	pingPongTimer = 2 * time.Second
 )