diff --git a/package.json b/package.json
index 10f2e72b..ade7ce8d 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,8 @@
     "@ethereumjs/tx": "^5.2.1",
     "@ethereumjs/util": "^9.0.2",
     "@ethersproject/bytes": "^5.7.0",
+    "@ethersproject/keccak256": "^5.8.0",
+    "@ethersproject/transactions": "^5.7.0",
     "@metamask/base-controller": "^7.0.1",
     "@metamask/controller-utils": "^11.0.0",
     "@metamask/eth-json-rpc-provider": "^4.1.6",
diff --git a/src/SmartTransactionsController.test.ts b/src/SmartTransactionsController.test.ts
index b0e2bf91..1693560e 100644
--- a/src/SmartTransactionsController.test.ts
+++ b/src/SmartTransactionsController.test.ts
@@ -39,11 +39,6 @@ import type { SmartTransaction, UnsignedTransaction, Hex } from './types';
 import { SmartTransactionStatuses, ClientId } from './types';
 import * as utils from './utils';
 
-jest.mock('@ethersproject/bytes', () => ({
-  ...jest.requireActual('@ethersproject/bytes'),
-  hexlify: (str: string) => `0x${str}`,
-}));
-
 jest.mock('@metamask/eth-query', () => {
   const EthQuery = jest.requireActual('@metamask/eth-query');
   return class FakeEthQuery extends EthQuery {
@@ -730,7 +725,7 @@ describe('SmartTransactionsController', () => {
     it('should acquire nonce for Swap transactions only', async () => {
       // Create a mock for getNonceLock
       const mockGetNonceLock = jest.fn().mockResolvedValue({
-        nextNonce: 'nextNonce',
+        nextNonce: 42,
         nonceDetails: { test: 'details' },
         releaseLock: jest.fn(),
       });
@@ -840,7 +835,7 @@ describe('SmartTransactionsController', () => {
             ][0];
 
           // Verify nonce was set correctly on the txParams in the created transaction
-          expect(createdSmartTransaction.txParams.nonce).toBe('0x42'); // 42 as a hex string
+          expect(createdSmartTransaction.txParams.nonce).toBe('0x2a'); // 42 in hex
 
           // Verify transaction type is set to 'swap' by default
           expect(createdSmartTransaction.type).toBe('swap');
@@ -2652,7 +2647,7 @@ async function withController<ReturnValue>(
     messenger,
     clientId: ClientId.Mobile,
     getNonceLock: jest.fn().mockResolvedValue({
-      nextNonce: 'nextNonce',
+      nextNonce: 42,
       releaseLock: jest.fn(),
     }),
     confirmExternalTransaction: jest.fn(),
diff --git a/src/utils.test.ts b/src/utils.test.ts
index 5d06b53f..42a8aa46 100644
--- a/src/utils.test.ts
+++ b/src/utils.test.ts
@@ -1,3 +1,5 @@
+import { arrayify, hexlify } from '@ethersproject/bytes';
+import { keccak256 } from '@ethersproject/keccak256';
 import { ChainId, NetworkType } from '@metamask/controller-utils';
 import {
   type TransactionMeta,
@@ -372,7 +374,14 @@ describe('src/utils.js', () => {
     it('throws an error with an incorrect signed transaction', () => {
       expect(() => {
         utils.getTxHash('0x0302b75dfb9fd9eb34056af0');
-      }).toThrow('kzg instance required to instantiate blob tx');
+      }).toThrow('unsupported transaction type: 3');
+    });
+
+    it('computes hash for type 4 transaction', () => {
+      const type4TxHex = '0x04010203040506070809';
+      const expectedHash = hexlify(keccak256(arrayify(type4TxHex)));
+      const txHash = utils.getTxHash(type4TxHex);
+      expect(txHash).toBe(expectedHash);
     });
   });
 
diff --git a/src/utils.ts b/src/utils.ts
index 1fd34882..cabdc178 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,6 +1,6 @@
-import { TransactionFactory } from '@ethereumjs/tx';
-import { bytesToHex } from '@ethereumjs/util';
-import { hexlify } from '@ethersproject/bytes';
+import { arrayify, hexlify } from '@ethersproject/bytes';
+import { keccak256 } from '@ethersproject/keccak256';
+import { parse } from '@ethersproject/transactions';
 import type { TransactionMeta } from '@metamask/transaction-controller';
 import { TransactionStatus } from '@metamask/transaction-controller';
 import { BigNumber } from 'bignumber.js';
@@ -224,15 +224,23 @@ export const incrementNonceInHex = (nonceInHex: string): string => {
   return hexlify(Number(nonceInDec) + 1);
 };
 
+const isType4Transaction = (signedTxHex: string) => {
+  return typeof signedTxHex === 'string' && signedTxHex.startsWith('0x04');
+};
+
 export const getTxHash = (signedTxHex: any) => {
   if (!signedTxHex) {
     return '';
   }
-  const txHashBytes = TransactionFactory.fromSerializedData(
-    // eslint-disable-next-line no-restricted-globals
-    Buffer.from(signedTxHex.slice(2), 'hex'),
-  ).hash();
-  return bytesToHex(txHashBytes);
+  try {
+    const parsed = parse(signedTxHex);
+    return parsed?.hash ?? '';
+  } catch (error) {
+    if (isType4Transaction(signedTxHex)) {
+      return hexlify(keccak256(arrayify(signedTxHex)));
+    }
+    throw error;
+  }
 };
 
 export const getSmartTransactionMetricsProperties = (
diff --git a/yarn.lock b/yarn.lock
index 5ecc57c3..d24e59ed 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -665,6 +665,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@ethersproject/bytes@npm:^5.8.0":
+  version: 5.8.0
+  resolution: "@ethersproject/bytes@npm:5.8.0"
+  dependencies:
+    "@ethersproject/logger": ^5.8.0
+  checksum: 507e8ef1f1559590b4e78e3392a2b16090e96fb1091e0b08d3a8491df65976b313c29cdb412594454f68f9f04d5f77ea5a400b489d80a3e46a608156ef31b251
+  languageName: node
+  linkType: hard
+
 "@ethersproject/constants@npm:^5.7.0":
   version: 5.7.0
   resolution: "@ethersproject/constants@npm:5.7.0"
@@ -719,6 +728,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@ethersproject/keccak256@npm:^5.8.0":
+  version: 5.8.0
+  resolution: "@ethersproject/keccak256@npm:5.8.0"
+  dependencies:
+    "@ethersproject/bytes": ^5.8.0
+    js-sha3: 0.8.0
+  checksum: af3621d2b18af6c8f5181dacad91e1f6da4e8a6065668b20e4c24684bdb130b31e45e0d4dbaed86d4f1314d01358aa119f05be541b696e455424c47849d81913
+  languageName: node
+  linkType: hard
+
 "@ethersproject/logger@npm:^5.7.0":
   version: 5.7.0
   resolution: "@ethersproject/logger@npm:5.7.0"
@@ -726,6 +745,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@ethersproject/logger@npm:^5.8.0":
+  version: 5.8.0
+  resolution: "@ethersproject/logger@npm:5.8.0"
+  checksum: 6249885a7fd4a5806e4c8700b76ffcc8f1ff00d71f31aa717716a89fa6b391de19fbb0cb5ae2560b9f57ec0c2e8e0a11ebc2099124c73d3b42bc58e3eedc41d1
+  languageName: node
+  linkType: hard
+
 "@ethersproject/networks@npm:^5.7.0":
   version: 5.7.1
   resolution: "@ethersproject/networks@npm:5.7.1"
@@ -1660,6 +1686,8 @@ __metadata:
     "@ethereumjs/tx": ^5.2.1
     "@ethereumjs/util": ^9.0.2
     "@ethersproject/bytes": ^5.7.0
+    "@ethersproject/keccak256": ^5.8.0
+    "@ethersproject/transactions": ^5.7.0
     "@lavamoat/allow-scripts": ^3.2.1
     "@lavamoat/preinstall-always-fail": ^2.1.0
     "@metamask/auto-changelog": ^3.1.0