diff --git a/freqtrade/exchange/bybit.py b/freqtrade/exchange/bybit.py
index 3fc52b502..1891902f5 100644
--- a/freqtrade/exchange/bybit.py
+++ b/freqtrade/exchange/bybit.py
@@ -239,7 +239,7 @@ class Bybit(Exchange):
 
         return orders
 
-    def fetch_order(self, order_id: str, pair: str, params: Dict = {}) -> Dict:
+    def fetch_order(self, order_id: str, pair: str, params: Optional[Dict] = None) -> Dict:
         order = super().fetch_order(order_id, pair, params)
         if (
             order.get('status') == 'canceled'
diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index 033865af1..38c16ac22 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -1300,9 +1300,11 @@ class Exchange:
             raise OperationalException(e) from e
 
     @retrier(retries=API_FETCH_ORDER_RETRY_COUNT)
-    def fetch_order(self, order_id: str, pair: str, params: Dict = {}) -> Dict:
+    def fetch_order(self, order_id: str, pair: str, params: Optional[Dict] = None) -> Dict:
         if self._config['dry_run']:
             return self.fetch_dry_run_order(order_id)
+        if params is None:
+            params = {}
         try:
             if not self.exchange_has('fetchOrder'):
                 return self.fetch_order_emulated(order_id, pair, params)
@@ -1324,7 +1326,7 @@ class Exchange:
         except ccxt.BaseError as e:
             raise OperationalException(e) from e
 
-    def fetch_stoploss_order(self, order_id: str, pair: str, params: Dict = {}) -> Dict:
+    def fetch_stoploss_order(self, order_id: str, pair: str, params: Optional[Dict] = None) -> Dict:
         return self.fetch_order(order_id, pair, params)
 
     def fetch_order_or_stoploss_order(self, order_id: str, pair: str,
diff --git a/freqtrade/exchange/gate.py b/freqtrade/exchange/gate.py
index e7d7cfc74..1d25e2df3 100644
--- a/freqtrade/exchange/gate.py
+++ b/freqtrade/exchange/gate.py
@@ -98,7 +98,7 @@ class Gate(Exchange):
     def get_order_id_conditional(self, order: Dict[str, Any]) -> str:
         return safe_value_fallback2(order, order, 'id_stop', 'id')
 
-    def fetch_stoploss_order(self, order_id: str, pair: str, params: Dict = {}) -> Dict:
+    def fetch_stoploss_order(self, order_id: str, pair: str, params: Optional[Dict] = None) -> Dict:
         order = self.fetch_order(
             order_id=order_id,
             pair=pair,
diff --git a/freqtrade/exchange/okx.py b/freqtrade/exchange/okx.py
index 2677a3463..d919a73cc 100644
--- a/freqtrade/exchange/okx.py
+++ b/freqtrade/exchange/okx.py
@@ -202,7 +202,7 @@ class Okx(Exchange):
         order['type'] = 'stoploss'
         return order
 
-    def fetch_stoploss_order(self, order_id: str, pair: str, params: Dict = {}) -> Dict:
+    def fetch_stoploss_order(self, order_id: str, pair: str, params: Optional[Dict] = None) -> Dict:
         if self._config['dry_run']:
             return self.fetch_dry_run_order(order_id)