diff --git a/cmd/evm/internal/t8ntool/gen_stenv.go b/cmd/evm/internal/t8ntool/gen_stenv.go
index 695fdba1e..c7f079c02 100644
--- a/cmd/evm/internal/t8ntool/gen_stenv.go
+++ b/cmd/evm/internal/t8ntool/gen_stenv.go
@@ -16,11 +16,11 @@ var _ = (*stEnvMarshaling)(nil)
 // MarshalJSON marshals as JSON.
 func (s stEnv) MarshalJSON() ([]byte, error) {
 	type stEnv struct {
-		Coinbase    common.UnprefixedAddress            `json:"currentCoinbase" gencodec:"required"`
+		Coinbase    common.UnprefixedAddress            `json:"currentCoinbase"   gencodec:"required"`
 		Difficulty  *math.HexOrDecimal256               `json:"currentDifficulty" gencodec:"required"`
-		GasLimit    math.HexOrDecimal64                 `json:"currentGasLimit" gencodec:"required"`
-		Number      math.HexOrDecimal64                 `json:"currentNumber" gencodec:"required"`
-		Timestamp   math.HexOrDecimal64                 `json:"currentTimestamp" gencodec:"required"`
+		GasLimit    math.HexOrDecimal64                 `json:"currentGasLimit"   gencodec:"required"`
+		Number      math.HexOrDecimal64                 `json:"currentNumber"     gencodec:"required"`
+		Timestamp   math.HexOrDecimal64                 `json:"currentTimestamp"  gencodec:"required"`
 		BlockHashes map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
 		Ommers      []ommer                             `json:"ommers,omitempty"`
 		BaseFee     *math.HexOrDecimal256               `json:"currentBaseFee,omitempty"`
@@ -40,11 +40,11 @@ func (s stEnv) MarshalJSON() ([]byte, error) {
 // UnmarshalJSON unmarshals from JSON.
 func (s *stEnv) UnmarshalJSON(input []byte) error {
 	type stEnv struct {
-		Coinbase    *common.UnprefixedAddress           `json:"currentCoinbase" gencodec:"required"`
+		Coinbase    *common.UnprefixedAddress           `json:"currentCoinbase"   gencodec:"required"`
 		Difficulty  *math.HexOrDecimal256               `json:"currentDifficulty" gencodec:"required"`
-		GasLimit    *math.HexOrDecimal64                `json:"currentGasLimit" gencodec:"required"`
-		Number      *math.HexOrDecimal64                `json:"currentNumber" gencodec:"required"`
-		Timestamp   *math.HexOrDecimal64                `json:"currentTimestamp" gencodec:"required"`
+		GasLimit    *math.HexOrDecimal64                `json:"currentGasLimit"   gencodec:"required"`
+		Number      *math.HexOrDecimal64                `json:"currentNumber"     gencodec:"required"`
+		Timestamp   *math.HexOrDecimal64                `json:"currentTimestamp"  gencodec:"required"`
 		BlockHashes map[math.HexOrDecimal64]common.Hash `json:"blockHashes,omitempty"`
 		Ommers      []ommer                             `json:"ommers,omitempty"`
 		BaseFee     *math.HexOrDecimal256               `json:"currentBaseFee,omitempty"`
diff --git a/eth/ethconfig/gen_config.go b/eth/ethconfig/gen_config.go
index ca93b2ad0..55c210f2c 100644
--- a/eth/ethconfig/gen_config.go
+++ b/eth/ethconfig/gen_config.go
@@ -3,6 +3,7 @@
 package ethconfig
 
 import (
+	"math/big"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -55,10 +56,11 @@ func (c Config) MarshalTOML() (interface{}, error) {
 		DocRoot                 string `toml:"-"`
 		EWASMInterpreter        string
 		EVMInterpreter          string
-		RPCGasCap               uint64                         `toml:",omitempty"`
-		RPCTxFeeCap             float64                        `toml:",omitempty"`
+		RPCGasCap               uint64
+		RPCTxFeeCap             float64
 		Checkpoint              *params.TrustedCheckpoint      `toml:",omitempty"`
 		CheckpointOracle        *params.CheckpointOracleConfig `toml:",omitempty"`
+		OverrideLondon          *big.Int                       `toml:",omitempty"`
 	}
 	var enc Config
 	enc.Genesis = c.Genesis
@@ -103,6 +105,7 @@ func (c Config) MarshalTOML() (interface{}, error) {
 	enc.RPCTxFeeCap = c.RPCTxFeeCap
 	enc.Checkpoint = c.Checkpoint
 	enc.CheckpointOracle = c.CheckpointOracle
+	enc.OverrideLondon = c.OverrideLondon
 	return &enc, nil
 }
 
@@ -147,10 +150,11 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 		DocRoot                 *string `toml:"-"`
 		EWASMInterpreter        *string
 		EVMInterpreter          *string
-		RPCGasCap               *uint64                        `toml:",omitempty"`
-		RPCTxFeeCap             *float64                       `toml:",omitempty"`
+		RPCGasCap               *uint64
+		RPCTxFeeCap             *float64
 		Checkpoint              *params.TrustedCheckpoint      `toml:",omitempty"`
 		CheckpointOracle        *params.CheckpointOracleConfig `toml:",omitempty"`
+		OverrideLondon          *big.Int                       `toml:",omitempty"`
 	}
 	var dec Config
 	if err := unmarshal(&dec); err != nil {
@@ -282,5 +286,8 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 	if dec.CheckpointOracle != nil {
 		c.CheckpointOracle = dec.CheckpointOracle
 	}
+	if dec.OverrideLondon != nil {
+		c.OverrideLondon = dec.OverrideLondon
+	}
 	return nil
 }