diff --git a/core/forkid/forkid_test.go b/core/forkid/forkid_test.go
index 5829e863e4..916bffadc0 100644
--- a/core/forkid/forkid_test.go
+++ b/core/forkid/forkid_test.go
@@ -61,8 +61,10 @@ func TestCreation(t *testing.T) {
 				{9199999, ID{Hash: checksumToBytes(0x879d6e30), Next: 9200000}},   // Last Istanbul and first Muir Glacier block
 				{9200000, ID{Hash: checksumToBytes(0xe029e991), Next: 12244000}},  // First Muir Glacier block
 				{12243999, ID{Hash: checksumToBytes(0xe029e991), Next: 12244000}}, // Last Muir Glacier block
-				{12244000, ID{Hash: checksumToBytes(0x0eb440f6), Next: 0}},        // First Berlin block
-				{20000000, ID{Hash: checksumToBytes(0x0eb440f6), Next: 0}},        // Future Berlin block
+				{12244000, ID{Hash: checksumToBytes(0x0eb440f6), Next: 12965000}}, // First Berlin block
+				{12964999, ID{Hash: checksumToBytes(0x0eb440f6), Next: 12965000}}, // Last Berlin block
+				{12965000, ID{Hash: checksumToBytes(0xb715077d), Next: 0}},        // First London block
+				{20000000, ID{Hash: checksumToBytes(0xb715077d), Next: 0}},        // Future London block
 			},
 		},
 		// Ropsten test cases
@@ -203,11 +205,11 @@ func TestValidation(t *testing.T) {
 		// Local is mainnet Petersburg, remote is Rinkeby Petersburg.
 		{7987396, ID{Hash: checksumToBytes(0xafec6b27), Next: 0}, ErrLocalIncompatibleOrStale},
 
-		// Local is mainnet Berlin, far in the future. Remote announces Gopherium (non existing fork)
+		// Local is mainnet London, far in the future. Remote announces Gopherium (non existing fork)
 		// at some future block 88888888, for itself, but past block for local. Local is incompatible.
 		//
 		// This case detects non-upgraded nodes with majority hash power (typical Ropsten mess).
-		{88888888, ID{Hash: checksumToBytes(0x0eb440f6), Next: 88888888}, ErrLocalIncompatibleOrStale},
+		{88888888, ID{Hash: checksumToBytes(0xb715077d), Next: 88888888}, ErrLocalIncompatibleOrStale},
 
 		// Local is mainnet Byzantium. Remote is also in Byzantium, but announces Gopherium (non existing
 		// fork) at block 7279999, before Petersburg. Local is incompatible.
diff --git a/params/config.go b/params/config.go
index 31da38a7bd..eaa7f92422 100644
--- a/params/config.go
+++ b/params/config.go
@@ -69,6 +69,7 @@ var (
 		IstanbulBlock:       big.NewInt(9_069_000),
 		MuirGlacierBlock:    big.NewInt(9_200_000),
 		BerlinBlock:         big.NewInt(12_244_000),
+		LondonBlock:         big.NewInt(12_965_000),
 		Ethash:              new(EthashConfig),
 	}