diff --git a/tests/gen_sttransaction.go b/tests/gen_sttransaction.go
index f47da494f..9b5aecbfe 100644
--- a/tests/gen_sttransaction.go
+++ b/tests/gen_sttransaction.go
@@ -27,6 +27,7 @@ func (s stTransaction) MarshalJSON() ([]byte, error) {
 		GasLimit             []math.HexOrDecimal64 `json:"gasLimit"`
 		Value                []string              `json:"value"`
 		PrivateKey           hexutil.Bytes         `json:"secretKey"`
+		Sender               *common.Address       `json:"sender"`
 		BlobVersionedHashes  []common.Hash         `json:"blobVersionedHashes,omitempty"`
 		BlobGasFeeCap        *math.HexOrDecimal256 `json:"maxFeePerBlobGas,omitempty"`
 	}
@@ -46,6 +47,7 @@ func (s stTransaction) MarshalJSON() ([]byte, error) {
 	}
 	enc.Value = s.Value
 	enc.PrivateKey = s.PrivateKey
+	enc.Sender = s.Sender
 	enc.BlobVersionedHashes = s.BlobVersionedHashes
 	enc.BlobGasFeeCap = (*math.HexOrDecimal256)(s.BlobGasFeeCap)
 	return json.Marshal(&enc)
@@ -64,6 +66,7 @@ func (s *stTransaction) UnmarshalJSON(input []byte) error {
 		GasLimit             []math.HexOrDecimal64 `json:"gasLimit"`
 		Value                []string              `json:"value"`
 		PrivateKey           *hexutil.Bytes        `json:"secretKey"`
+		Sender               *common.Address       `json:"sender"`
 		BlobVersionedHashes  []common.Hash         `json:"blobVersionedHashes,omitempty"`
 		BlobGasFeeCap        *math.HexOrDecimal256 `json:"maxFeePerBlobGas,omitempty"`
 	}
@@ -104,6 +107,9 @@ func (s *stTransaction) UnmarshalJSON(input []byte) error {
 	if dec.PrivateKey != nil {
 		s.PrivateKey = *dec.PrivateKey
 	}
+	if dec.Sender != nil {
+		s.Sender = dec.Sender
+	}
 	if dec.BlobVersionedHashes != nil {
 		s.BlobVersionedHashes = dec.BlobVersionedHashes
 	}
diff --git a/tests/state_test_util.go b/tests/state_test_util.go
index 113c796ca..8c255c1b5 100644
--- a/tests/state_test_util.go
+++ b/tests/state_test_util.go
@@ -115,6 +115,7 @@ type stTransaction struct {
 	GasLimit             []uint64            `json:"gasLimit"`
 	Value                []string            `json:"value"`
 	PrivateKey           []byte              `json:"secretKey"`
+	Sender               *common.Address     `json:"sender"`
 	BlobVersionedHashes  []common.Hash       `json:"blobVersionedHashes,omitempty"`
 	BlobGasFeeCap        *big.Int            `json:"maxFeePerBlobGas,omitempty"`
 }
@@ -359,9 +360,12 @@ func (t *StateTest) genesis(config *params.ChainConfig) *core.Genesis {
 }
 
 func (tx *stTransaction) toMessage(ps stPostState, baseFee *big.Int) (*core.Message, error) {
-	// Derive sender from private key if present.
 	var from common.Address
-	if len(tx.PrivateKey) > 0 {
+	// If 'sender' field is present, use that
+	if tx.Sender != nil {
+		from = *tx.Sender
+	} else if len(tx.PrivateKey) > 0 {
+		// Derive sender from private key if needed.
 		key, err := crypto.ToECDSA(tx.PrivateKey)
 		if err != nil {
 			return nil, fmt.Errorf("invalid private key: %v", err)