diff --git a/config/protocol.testnet.yml b/config/protocol.testnet.yml
index 2275060ab..9d6f407b1 100644
--- a/config/protocol.testnet.yml
+++ b/config/protocol.testnet.yml
@@ -1,5 +1,5 @@
 ProtocolConfiguration:
-  Magic: 844378958
+  Magic: 877933390
   MaxTraceableBlocks: 2102400
   SecondsPerBlock: 15
   MemPoolSize: 50000
diff --git a/pkg/config/netmode/netmode.go b/pkg/config/netmode/netmode.go
index 73719de92..94a23985f 100644
--- a/pkg/config/netmode/netmode.go
+++ b/pkg/config/netmode/netmode.go
@@ -6,7 +6,7 @@ const (
 	// MainNet contains magic code used in the NEO main official network.
 	MainNet Magic = 0x004f454e // 5195086
 	// TestNet contains magic code used in the NEO testing network.
-	TestNet Magic = 0x3254334e // N3T2
+	TestNet Magic = 0x3454334e // N3T4
 	// PrivNet contains magic code usually used for NEO private networks.
 	PrivNet Magic = 56753 // docker privnet
 	// UnitTestNet is a stub magic code used for testing purposes.