diff --git a/unicorn_binance_rest_api/manager.py b/unicorn_binance_rest_api/manager.py
index 8fd79c0..ab4b5cf 100644
--- a/unicorn_binance_rest_api/manager.py
+++ b/unicorn_binance_rest_api/manager.py
@@ -667,7 +667,7 @@ def get_version(self):
         """
         return self.version
 
-    def get_latest_version(self):
+    def get_latest_version(self) -> Optional[str]:
         """
         Get the version of the latest available release (cache time 1 hour)
         :return: str or False