diff --git a/client/src/telethon/_impl/mtsender/reconnection.py b/client/src/telethon/_impl/mtsender/reconnection.py
index 20e38777..19054f6b 100644
--- a/client/src/telethon/_impl/mtsender/reconnection.py
+++ b/client/src/telethon/_impl/mtsender/reconnection.py
@@ -1,4 +1,5 @@
 from abc import ABC, abstractmethod
+from typing import Optional
 
 
 class ReconnectionPolicy(ABC):
@@ -10,14 +11,14 @@ class ReconnectionPolicy(ABC):
     """
 
     @abstractmethod
-    def should_retry(self, attempts: int) -> float | None:
+    def should_retry(self, attempts: int) -> Optional[float]:
         """
         Determines whether the client should retry the connection attempt.
         """
 
 
 class NoReconnect(ReconnectionPolicy):
-    def should_retry(self, attempts: int) -> float | None:
+    def should_retry(self, attempts: int) -> Optional[float]:
         return None
 
 
@@ -28,7 +29,7 @@ class FixedReconnect(ReconnectionPolicy):
         self.max_attempts = attempts
         self.delay = delay
 
-    def should_retry(self, attempts: int) -> float | None:
+    def should_retry(self, attempts: int) -> Optional[float]:
         if attempts < self.max_attempts:
             return self.delay
 
diff --git a/client/src/telethon/_impl/mtsender/sender.py b/client/src/telethon/_impl/mtsender/sender.py
index db60b3ce..37ab838c 100644
--- a/client/src/telethon/_impl/mtsender/sender.py
+++ b/client/src/telethon/_impl/mtsender/sender.py
@@ -166,7 +166,7 @@ class Sender:
     addr: str
     mtp: Mtp
     _connector: Connector
-    _reconnection_policy: ReconnectionPolicy | None
+    _reconnection_policy: Optional[ReconnectionPolicy]
     _logger: logging.Logger
     _reader: AsyncReader
     _writer: AsyncWriter
@@ -190,7 +190,7 @@ class Sender:
         addr: str,
         *,
         connector: Connector,
-        reconnection_policy: ReconnectionPolicy | None = None,
+        reconnection_policy: Optional[ReconnectionPolicy] = None,
         base_logger: logging.Logger,
     ) -> Self:
         ip, port = addr.split(":")
@@ -570,7 +570,7 @@ async def connect(
     auth_key: Optional[bytes],
     base_logger: logging.Logger,
     connector: Connector,
-    reconnection_policy: ReconnectionPolicy | None = None,
+    reconnection_policy: Optional[ReconnectionPolicy] = None,
 ) -> Sender:
     if auth_key is None:
         sender = await Sender.connect(