diff --git a/eth/protocol.go b/eth/protocol.go
index 963d417940..7c5d09489b 100644
--- a/eth/protocol.go
+++ b/eth/protocol.go
@@ -13,7 +13,7 @@ import (
 )
 
 const (
-	ProtocolVersion    = 49
+	ProtocolVersion    = 51
 	NetworkId          = 0
 	ProtocolLength     = uint64(8)
 	ProtocolMaxMsgSize = 10 * 1024 * 1024