diff --git a/package.json b/package.json
index ccda3d3..7e3a6c4 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,6 @@
     "hdkey": "^1.1.1",
     "randombytes": "^2.0.6",
     "safe-buffer": "^5.1.2",
-    "scrypt.js": "^0.3.0",
     "utf8": "^3.0.0",
     "uuid": "^3.3.2"
   },
@@ -54,7 +53,7 @@
     "husky": "^2.1.0",
     "istanbul": "^0.4.5",
     "mocha": "^5.2.0",
-    "standard": "^12.0.0"
+    "standard": "^12.0.1"
   },
   "standard": {
     "globals": [
diff --git a/src/index.js b/src/index.js
index dfc3442..e5e7f66 100644
--- a/src/index.js
+++ b/src/index.js
@@ -2,7 +2,6 @@ var Buffer = require('safe-buffer').Buffer
 var ethUtil = require('ethereumjs-util')
 var crypto = require('crypto')
 var randomBytes = require('randombytes')
-var scryptsy = require('scrypt.js')
 var uuidv4 = require('uuid/v4')
 var bs58check = require('bs58check')
 
@@ -130,7 +129,7 @@ Wallet.prototype.toV3 = function (password, opts) {
     kdfparams.n = opts.n || 262144
     kdfparams.r = opts.r || 8
     kdfparams.p = opts.p || 1
-    derivedKey = scryptsy(Buffer.from(password), salt, kdfparams.n, kdfparams.r, kdfparams.p, kdfparams.dklen)
+    derivedKey = crypto.scryptSync(Buffer.from(password), salt, kdfparams.dklen, { 'cost': kdfparams.n, 'blockSize': kdfparams.r, 'parallelization': kdfparams.p })
   } else {
     throw new Error('Unsupported kdf')
   }
@@ -226,7 +225,7 @@ Wallet.fromV1 = function (input, password) {
   }
 
   var kdfparams = json.Crypto.KeyHeader.KdfParams
-  var derivedKey = scryptsy(Buffer.from(password), Buffer.from(json.Crypto.Salt, 'hex'), kdfparams.N, kdfparams.R, kdfparams.P, kdfparams.DkLen)
+  var derivedKey = crypto.scryptSync(Buffer.from(password), Buffer.from(json.Crypto.Salt, 'hex'), kdfparams.dklen, { 'cost': kdfparams.n, 'blockSize': kdfparams.r, 'parallelization': kdfparams.p })
 
   var ciphertext = Buffer.from(json.Crypto.CipherText, 'hex')
 
@@ -256,7 +255,7 @@ Wallet.fromV3 = function (input, password, nonStrict) {
     kdfparams = json.crypto.kdfparams
 
     // FIXME: support progress reporting callback
-    derivedKey = scryptsy(Buffer.from(password), Buffer.from(kdfparams.salt, 'hex'), kdfparams.n, kdfparams.r, kdfparams.p, kdfparams.dklen)
+    derivedKey = crypto.scryptSync(Buffer.from(password), Buffer.from(kdfparams.salt, 'hex'), kdfparams.dklen, { 'cost': kdfparams.n, 'blockSize': kdfparams.r, 'parallelization': kdfparams.p })
   } else if (json.crypto.kdf === 'pbkdf2') {
     kdfparams = json.crypto.kdfparams
 
diff --git a/src/thirdparty.js b/src/thirdparty.js
index 41a9d85..86c190d 100644
--- a/src/thirdparty.js
+++ b/src/thirdparty.js
@@ -1,7 +1,6 @@
 var Wallet = require('./index.js')
 var ethUtil = require('ethereumjs-util')
 var crypto = require('crypto')
-var scryptsy = require('scrypt.js')
 var utf8 = require('utf8')
 var aesjs = require('aes-js')
 var Buffer = require('safe-buffer').Buffer
@@ -186,7 +185,12 @@ Thirdparty.fromKryptoKit = function (entropy, password) {
     var checksum = entropy.slice(30, 46)
 
     var salt = kryptoKitBrokenScryptSeed(encryptedSeed)
-    var aesKey = scryptsy(Buffer.from(password, 'utf8'), salt, 16384, 8, 1, 32)
+    var dklen = 32
+    var n = 16384
+    var r = 8
+    var p = 1
+
+    var aesKey = crypto.scryptSync(Buffer.from(password, 'utf8'), salt, dklen, { 'cost': n, 'blockSize': r, 'parallelization': p })
 
     /* FIXME: try to use `crypto` instead of `aesjs`