diff --git a/lil_aretomo/aretomo.py b/lil_aretomo/aretomo.py
index e1dbb66..d3c0d7b 100644
--- a/lil_aretomo/aretomo.py
+++ b/lil_aretomo/aretomo.py
@@ -1,5 +1,5 @@
 from pathlib import Path
-from typing import List, Optional
+from typing import List, Optional, Tuple
 from rich.console import Console
 
 from .utils import (
@@ -20,7 +20,7 @@ def run_aretomo_alignment(
         local_align: Optional[bool] = False,
         target_pixel_size: Optional[float] = 10,
         nominal_rotation_angle: Optional[float] = None,
-        n_patches_xy: Optional[tuple[int, int]] = (5, 4),
+        n_patches_xy: Optional[Tuple[int, int]] = (5, 4),
         thickness_for_alignment: Optional[float] = 800,
         correct_tilt_angle_offset: Optional[bool] = False	
 ):
diff --git a/lil_aretomo/utils.py b/lil_aretomo/utils.py
index d7a83c5..fc49cc7 100644
--- a/lil_aretomo/utils.py
+++ b/lil_aretomo/utils.py
@@ -2,7 +2,7 @@
 import shutil
 import subprocess
 from pathlib import Path
-from typing import List
+from typing import List, Tuple
 
 import numpy as np
 
@@ -32,7 +32,7 @@ def align_tilt_series_aretomo(
         aretomo_executable: Path,
         nominal_rotation_angle: bool or float,
         local_alignments: bool,
-        n_patches_xy: tuple[int, int],
+        n_patches_xy: Tuple[int, int],
         thickness_for_alignment: float,
         correct_tilt_angle_offset: bool
 ):