diff --git a/src/device/device_ledger.cpp b/src/device/device_ledger.cpp
index 4e89f835d..b0ccb329e 100644
--- a/src/device/device_ledger.cpp
+++ b/src/device/device_ledger.cpp
@@ -259,7 +259,7 @@ namespace hw {
 
     static int device_id = 0;
 
-    #define PROTOCOL_VERSION                    3
+    #define PROTOCOL_VERSION                    4
 
     #define INS_NONE                            0x00
     #define INS_RESET                           0x02