diff --git a/requirements.txt b/requirements.txt
index 5cdf7bb..fd0f5d1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 coverage==4.4.1
-pytest==3.2.0
-python-decouple==3.0
-requests==2.18.3
+pytest==3.2.1
+python-decouple==3.1
+requests==2.18.4
 tox==2.7.0
diff --git a/setup.py b/setup.py
index 1be05ce..d4613c8 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@
 
 setup(
     name='trading_api_wrappers',
-    version='0.3.4',
+    version='0.3.5',
     description='Trading API Wrappers for Python 3.5',
     url='https://github.com/delta575/trading-api-wrappers',
     author='Felipe Aránguiz, Sebastián Aránguiz',
diff --git a/trading_api_wrappers/surbtc/client_auth.py b/trading_api_wrappers/surbtc/client_auth.py
index 515160d..4e4b65c 100644
--- a/trading_api_wrappers/surbtc/client_auth.py
+++ b/trading_api_wrappers/surbtc/client_auth.py
@@ -218,7 +218,7 @@ def deposits(self, currency: _c.Currency):
     def withdrawal(self,
                    currency: _c.Currency,
                    amount: float,
-                   target_address,
+                   target_address: str=None,
                    amount_includes_fee: bool=True,
                    simulate: bool=False):
         currency = _c.Currency.check(currency).value
diff --git a/trading_api_wrappers/surbtc/models.py b/trading_api_wrappers/surbtc/models.py
index af6568f..3ee729c 100644
--- a/trading_api_wrappers/surbtc/models.py
+++ b/trading_api_wrappers/surbtc/models.py
@@ -389,8 +389,8 @@ class TransferData(
     def create_from_json(cls, transfer, address_key):
         return cls(
             type=transfer['type'],
-            address=transfer[address_key],
-            tx_hash=transfer['tx_hash']
+            address=transfer.get(address_key),
+            tx_hash=transfer.get('tx_hash'),
         )