diff --git a/lib/model/address.js b/lib/model/address.js
index 9b024ab..159c29f 100644
--- a/lib/model/address.js
+++ b/lib/model/address.js
@@ -47,7 +47,7 @@ Address._deriveAddress = function(scriptType, publicKeyRing, path, m, network) {
 
   var publicKeys = _.map(publicKeyRing, function(item) {
     var xpub = new Bitcore.HDPublicKey(item.xPubKey);
-    return xpub.derive(path).publicKey;
+    return xpub.deriveChild(path).publicKey;
   });
 
   var bitcoreAddress;
diff --git a/lib/model/txproposal.js b/lib/model/txproposal.js
index a6f736b..0294b66 100644
--- a/lib/model/txproposal.js
+++ b/lib/model/txproposal.js
@@ -333,7 +333,7 @@ TxProposal.prototype._addSignaturesToBitcoreTx = function(tx, signatures, xpub)
     var input = self.inputs[i];
     try {
       var signature = Bitcore.crypto.Signature.fromString(signatureHex);
-      var pub = x.derive(self.inputPaths[i]).publicKey;
+      var pub = x.deriveChild(self.inputPaths[i]).publicKey;
       var s = {
         inputIndex: i,
         signature: signature,
diff --git a/lib/server.js b/lib/server.js
index 5590cb6..8b6c43a 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -472,7 +472,7 @@ WalletService.prototype._verifySignature = function(text, signature, pubkey) {
  * @param xPubKey
  */
 WalletService.prototype._verifyRequestPubKey = function(requestPubKey, signature, xPubKey) {
-  var pub = (new Bitcore.HDPublicKey(xPubKey)).derive(Constants.PATHS.REQUEST_KEY_AUTH).publicKey;
+  var pub = (new Bitcore.HDPublicKey(xPubKey)).deriveChild(Constants.PATHS.REQUEST_KEY_AUTH).publicKey;
   return Utils.verifyMessage(requestPubKey, signature, pub.toString());
 };
 
@@ -2017,7 +2017,7 @@ WalletService.prototype.createTx = function(opts, cb) {
   });
 };
 WalletService.prototype._verifyRequestPubKey = function(requestPubKey, signature, xPubKey) {
-  var pub = (new Bitcore.HDPublicKey(xPubKey)).derive(Constants.PATHS.REQUEST_KEY_AUTH).publicKey;
+  var pub = (new Bitcore.HDPublicKey(xPubKey)).deriveChild(Constants.PATHS.REQUEST_KEY_AUTH).publicKey;
   return Utils.verifyMessage(requestPubKey, signature, pub.toString());
 };
 
diff --git a/test/integration/helpers.js b/test/integration/helpers.js
index ec49d5b..825d0af 100644
--- a/test/integration/helpers.js
+++ b/test/integration/helpers.js
@@ -88,7 +88,7 @@ helpers.signMessage = function(text, privKey) {
 };
 
 helpers.signRequestPubKey = function(requestPubKey, xPrivKey) {
-  var priv = new Bitcore.HDPrivateKey(xPrivKey).derive(Constants.PATHS.REQUEST_KEY_AUTH).privateKey;
+  var priv = new Bitcore.HDPrivateKey(xPrivKey).deriveChild(Constants.PATHS.REQUEST_KEY_AUTH).privateKey;
   return helpers.signMessage(requestPubKey, priv);
 };
 
@@ -113,18 +113,18 @@ helpers._generateCopayersTestData = function(n) {
     var xpriv = new Bitcore.HDPrivateKey();
     var xpub = Bitcore.HDPublicKey(xpriv);
 
-    var xpriv_45H = xpriv.derive(45, true);
+    var xpriv_45H = xpriv.deriveChild(45, true);
     var xpub_45H = Bitcore.HDPublicKey(xpriv_45H);
     var id45 = Copayer._xPubToCopayerId(xpub_45H.toString());
 
-    var xpriv_44H_0H_0H = xpriv.derive(44, true).derive(0, true).derive(0, true);
+    var xpriv_44H_0H_0H = xpriv.deriveChild(44, true).deriveChild(0, true).deriveChild(0, true);
     var xpub_44H_0H_0H = Bitcore.HDPublicKey(xpriv_44H_0H_0H);
     var id44 = Copayer._xPubToCopayerId(xpub_44H_0H_0H.toString());
 
-    var xpriv_1H = xpriv.derive(1, true);
+    var xpriv_1H = xpriv.deriveChild(1, true);
     var xpub_1H = Bitcore.HDPublicKey(xpriv_1H);
-    var priv = xpriv_1H.derive(0).privateKey;
-    var pub = xpub_1H.derive(0).publicKey;
+    var priv = xpriv_1H.deriveChild(0).privateKey;
+    var pub = xpub_1H.deriveChild(0).publicKey;
 
     console.log('{id44: ', "'" + id44 + "',");
     console.log('id45: ', "'" + id45 + "',");
@@ -374,7 +374,7 @@ helpers.clientSign = function(txp, derivedXPrivKey) {
 
   _.each(txp.inputs, function(i) {
     if (!derived[i.path]) {
-      derived[i.path] = xpriv.derive(i.path).privateKey;
+      derived[i.path] = xpriv.deriveChild(i.path).privateKey;
       privs.push(derived[i.path]);
     }
   });