diff --git a/README.md b/README.md
index 9456985..bf98f7a 100644
--- a/README.md
+++ b/README.md
@@ -235,7 +235,7 @@ const identity = EthCrypto.createIdentity();
 const rawTx = {
     from: identity.address,
     to: '0x86Fa049857E0209aa7D9e616F7eb3b3B78ECfdb0',
-    value: 1000000000000000000,
+    value: new BN('1000000000000000000'),
     gasPrice: 5000000000,
     nonce: 0,
     gasLimit: 21000
diff --git a/package.json b/package.json
index 108d614..11cb9f0 100644
--- a/package.json
+++ b/package.json
@@ -95,10 +95,10 @@
   },
   "dependencies": {
     "@babel/runtime": "7.16.7",
-    "@ethereumjs/tx": "3.3.1",
+    "@ethereumjs/tx": "^3.4.0",
     "@types/bn.js": "5.1.0",
     "eccrypto": "1.1.6",
-    "ethereumjs-util": "7.1.1",
+    "ethereumjs-util": "^7.1.3",
     "ethers": "5.5.4",
     "secp256k1": "4.0.3"
   }
diff --git a/test/integration.test.js b/test/integration.test.js
index e86b8f1..56414d1 100644
--- a/test/integration.test.js
+++ b/test/integration.test.js
@@ -4,6 +4,7 @@ const path = require('path');
 const AsyncTestUtil = require('async-test-util');
 const SolidityCli = require('solidity-cli');
 const assert = require('assert');
+const BN = require('bn.js');
 const EthCrypto = require('../dist/lib/index');
 // const web3 = EthCrypto.util.web3;
 
@@ -109,7 +110,7 @@ describe('integration.test.js', () => {
             const rawTx = {
                 from: identity.address,
                 to: '0x63dcee1fd1d814858acd4172bb20e1aa0c947c0a',
-                value: parseInt(web3.utils.toWei('1', 'ether')),
+                value: new BN(web3.utils.toWei('1', 'ether')),
                 nonce: 0,
                 gasLimit: 60000,
                 gasPrice: parseInt(gasPrice)
diff --git a/test/tutorials/signed-data.test.js b/test/tutorials/signed-data.test.js
index b7abf7b..2b1c759 100644
--- a/test/tutorials/signed-data.test.js
+++ b/test/tutorials/signed-data.test.js
@@ -6,6 +6,7 @@
 const ganache = require('ganache-cli');
 const Web3 = require('web3');
 const assert = require('assert');
+const BN = require('bn.js');
 const EthCrypto = require('../../dist/lib/index');
 
 describe('signed-data.md', () => {
@@ -86,7 +87,7 @@ describe('signed-data.md', () => {
             from: creatorIdentity.address,
             to: contractAddress,
             nonce: 1,
-            value: parseInt(web3.utils.toWei('3', 'ether')),
+            value: new BN(web3.utils.toWei('3', 'ether')),
             gasLimit: 600000,
             gasPrice: 20000000000
         };
diff --git a/test/unit.test.js b/test/unit.test.js
index 5c8952d..902e848 100644
--- a/test/unit.test.js
+++ b/test/unit.test.js
@@ -1,5 +1,6 @@
 const AsyncTestUtil = require('async-test-util');
 const assert = require('assert');
+const BN = require('bn.js');
 const EthCrypto = require('../dist/lib/index');
 
 const TEST_DATA = {
@@ -331,7 +332,7 @@ describe('unit.test.js', () => {
                 const rawTx = {
                     from: ident.address,
                     to: '0x86Fa049857E0209aa7D9e616F7eb3b3B78ECfdb0',
-                    value: 1000000000000000000,
+                    value: new BN('1000000000000000000'),
                     gasPrice: 5000000000,
                     gasLimit: 21000
                 };
@@ -348,7 +349,7 @@ describe('unit.test.js', () => {
                 const rawTx = {
                     from: ident.address,
                     to: '0x86Fa049857E0209aa7D9e616F7eb3b3B78ECfdb0',
-                    value: 1000000000000000000,
+                    value: new BN('1000000000000000000'),
                     gasPrice: 5000000000,
                     gasLimit: 21000
                 };
diff --git a/typings/index.d.ts b/typings/index.d.ts
index dc1083b..2d1aff8 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -1,4 +1,4 @@
-import BigNumber = require('bn.js');
+import BigNumber from 'bn.js';
 import { TxOptions } from '@ethereumjs/tx';
 
 type createIdentityType = (entropy?: Buffer) => {