diff --git a/okx/Account.py b/okx/Account.py
index 6fd6dd4..89f25b0 100644
--- a/okx/Account.py
+++ b/okx/Account.py
@@ -98,7 +98,7 @@ class AccountAPI(OkxClient):
         return self._request_with_params(GET, GET_INSTRUMENTS, params)
 
     # Get the maximum loan of isolated MARGIN
-    def get_max_loan(self, instId, mgnMode, mgnCcy):
+    def get_max_loan(self, instId, mgnMode, mgnCcy=''):
         params = {'instId': instId, 'mgnMode': mgnMode, 'mgnCcy': mgnCcy}
         return self._request_with_params(GET, MAX_LOAN, params)
 
diff --git a/okx/__init__.py b/okx/__init__.py
index ab41521..fa0038c 100644
--- a/okx/__init__.py
+++ b/okx/__init__.py
@@ -2,4 +2,4 @@
 Python SDK for the OKX API v5
 
 """
-__version__="0.3.2"
\ No newline at end of file
+__version__="0.3.3"
\ No newline at end of file