diff --git a/src/escpos/escpos.py b/src/escpos/escpos.py
index 47c65d4..9c13dd5 100644
--- a/src/escpos/escpos.py
+++ b/src/escpos/escpos.py
@@ -14,7 +14,7 @@ This module contains the abstract base class :py:class:`Escpos`.
 import textwrap
 from abc import ABCMeta, abstractmethod  # abstract base class support
 from re import match as re_match
-from typing import List, Optional, Union, Literal
+from typing import List, Literal, Optional, Union
 
 import barcode
 import qrcode
diff --git a/src/escpos/printer/serial.py b/src/escpos/printer/serial.py
index 380aed5..b90d9e8 100644
--- a/src/escpos/printer/serial.py
+++ b/src/escpos/printer/serial.py
@@ -10,7 +10,7 @@
 
 
 import functools
-from typing import Union, Optional
+from typing import Optional, Union
 
 from ..escpos import Escpos