diff --git a/polygon/rest/quotes.py b/polygon/rest/quotes.py
index c39b6665..0169321f 100644
--- a/polygon/rest/quotes.py
+++ b/polygon/rest/quotes.py
@@ -105,7 +105,7 @@ def get_real_time_currency_conversion(
         to: str,
         amount: float,
         precision: Union[int, Precision] = 2,
-        params: Dict[str, Any] = None,
+        params: Optional[Dict[str, Any]] = None,
         raw: bool = False,
     ) -> Union[RealTimeCurrencyConversion, HTTPResponse]:
         """