diff --git a/node_modules/eth-keyring-controller/index.js b/node_modules/eth-keyring-controller/index.js
index 250ab98..38615aa 100644
--- a/node_modules/eth-keyring-controller/index.js
+++ b/node_modules/eth-keyring-controller/index.js
@@ -84,15 +84,20 @@ class KeyringController extends EventEmitter {
    *
    * @emits KeyringController#unlock
    * @param {string} password - The password to encrypt the vault with
-   * @param {string} seed - The BIP44-compliant seed phrase.
+   * @param {string|Array<number>} seedPhrase - The BIP39-compliant seed phrase,
+   * either as a string or an array of UTF-8 bytes that represent the string.
    * @returns {Promise<Object>} A Promise that resolves to the state.
    */
-  createNewVaultAndRestore (password, seed) {
+  createNewVaultAndRestore(password, seedPhrase) {
+    const seedPhraseAsBuffer = typeof seedPhrase === 'string'
+      ? Buffer.from(seedPhrase, 'utf8')
+      : Buffer.from(seedPhrase)
+
     if (typeof password !== 'string') {
       return Promise.reject(new Error('Password must be text.'))
     }
 
-    if (!bip39.validateMnemonic(seed)) {
+    if (!bip39.validateMnemonic(seedPhraseAsBuffer)) {
       return Promise.reject(new Error('Seed phrase is invalid.'))
     }
 
@@ -101,7 +106,7 @@ class KeyringController extends EventEmitter {
     return this.persistAllKeyrings(password)
       .then(() => {
         return this.addNewKeyring('HD Key Tree', {
-          mnemonic: seed,
+          mnemonic: seedPhraseAsBuffer,
           numberOfAccounts: 1,
         })
       })