diff --git a/saqc/lib/ts_operators.py b/saqc/lib/ts_operators.py
index 2d619ae4c63dfc01579d5664f8ab0a499803bef2..3c9e528761df5f1fde4e1c2867ec18c858820004 100644
--- a/saqc/lib/ts_operators.py
+++ b/saqc/lib/ts_operators.py
@@ -13,7 +13,8 @@ from __future__ import annotations
 
 import re
 import sys
-from typing import Literal, Union
+from typing import Union
+from typing_extensions import Literal
 
 import numba as nb
 import numpy as np