diff --git a/src/sisl/geom/nanotube.py b/src/sisl/geom/nanotube.py
index 94a03b944e..3d501dbc4f 100644
--- a/src/sisl/geom/nanotube.py
+++ b/src/sisl/geom/nanotube.py
@@ -1,6 +1,8 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at https://mozilla.org/MPL/2.0/.
+from typing import Tuple
+
 import numpy as np
 
 from sisl import Atom, Geometry, Lattice
@@ -14,7 +16,7 @@
 @set_module("sisl.geom")
 def nanotube(bond: float,
              atoms=None,
-             chirality: tuple[int, int]=(1, 1)):
+             chirality: Tuple[int, int]=(1, 1)):
     """ Nanotube with user-defined chirality.
 
     This routine is implemented as in `ASE`_ with some cosmetic changes.
diff --git a/src/sisl/geom/surfaces.py b/src/sisl/geom/surfaces.py
index 27e7e7c900..fbebcc7474 100644
--- a/src/sisl/geom/surfaces.py
+++ b/src/sisl/geom/surfaces.py
@@ -4,7 +4,7 @@
 from collections import namedtuple
 from itertools import groupby
 from numbers import Integral
-from typing import Sequence, Union
+from typing import Sequence, Tuple, Union
 
 import numpy as np
 
@@ -277,7 +277,7 @@ def iter_func(key, layer):
 @set_module("sisl.geom")
 def fcc_slab(alat: float,
              atoms,
-             miller: Union[int, str, tuple[int, int, int]],
+             miller: Union[int, str, Tuple[int, int, int]],
              layers=None,
              vacuum: Union[float, Sequence[float]]=20.,
              *,
@@ -471,7 +471,7 @@ def fcc_slab(alat: float,
 @set_module("sisl.geom")
 def bcc_slab(alat: float,
              atoms,
-             miller: Union[int, str, tuple[int, int, int]],
+             miller: Union[int, str, Tuple[int, int, int]],
              layers=None,
              vacuum: Union[float, Sequence[float]]=20.,
              *,
@@ -625,7 +625,7 @@ def bcc_slab(alat: float,
 @set_module("sisl.geom")
 def rocksalt_slab(alat: float,
                   atoms,
-                  miller: Union[int, str, tuple[int, int, int]],
+                  miller: Union[int, str, Tuple[int, int, int]],
                   layers=None,
                   vacuum: Union[float, Sequence[float]]=20.,
                   *,
diff --git a/src/sisl/geometry.py b/src/sisl/geometry.py
index 489aa9e3d0..96c634fdf3 100644
--- a/src/sisl/geometry.py
+++ b/src/sisl/geometry.py
@@ -12,7 +12,7 @@
 from math import acos
 from numbers import Integral, Real
 from pathlib import Path
-from typing import TYPE_CHECKING, Iterator, List, Optional, Union
+from typing import TYPE_CHECKING, Iterator, List, Optional, Tuple, Union
 
 import numpy as np
 from numpy import (
@@ -933,7 +933,7 @@ def iR(self,
     def iter_block_rand(self,
                         iR: int=20,
                         R: Optional[float]=None,
-                        atoms: Optional[AtomsArgument]=None) -> Iterator[tuple[ndarray, ndarray]]:
+                        atoms: Optional[AtomsArgument]=None) -> Iterator[Tuple[ndarray, ndarray]]:
         """Perform the *random* block-iteration by randomly selecting the next center of block """
 
         # We implement yields as we can then do nested iterators
@@ -1010,7 +1010,7 @@ def iter_block_rand(self,
     def iter_block_shape(self,
                          shape=None,
                          iR: int=20,
-                         atoms: Optional[AtomsArgument]=None) -> Iterator[tuple[ndarray, ndarray]]:
+                         atoms: Optional[AtomsArgument]=None) -> Iterator[Tuple[ndarray, ndarray]]:
         """Perform the *grid* block-iteration by looping a grid """
 
         # We implement yields as we can then do nested iterators
@@ -1137,7 +1137,7 @@ def iter_block(self,
                    iR: int=20,
                    R: Optional[float]=None,
                    atoms: Optional[AtomsArgument]=None,
-                   method: str='rand') -> Iterator[tuple[ndarray, ndarray]]:
+                   method: str='rand') -> Iterator[Tuple[ndarray, ndarray]]:
         """Iterator for performance critical loops
 
         NOTE: This requires that `R` has been set correctly as the maximum interaction range.
@@ -1209,7 +1209,7 @@ def overlap(self,
                 other: GeometryLikeType,
                 eps: float=0.1,
                 offset=(0., 0., 0.),
-                offset_other=(0., 0., 0.)) -> tuple[ndarray, ndarray]:
+                offset_other=(0., 0., 0.)) -> Tuple[ndarray, ndarray]:
         """ Calculate the overlapping indices between two geometries
 
         Find equivalent atoms (in the primary unit-cell only) in two geometries.
@@ -1264,7 +1264,7 @@ def overlap(self,
             other_extend(idx)
         return _a.arrayi(idx_self), _a.arrayi(idx_other)
 
-    def sort(self, **kwargs) -> Union[Geometry, tuple[Geometry, List]]:
+    def sort(self, **kwargs) -> Union[Geometry, Tuple[Geometry, List]]:
         r""" Sort atoms in a nested fashion according to various criteria
 
         There are many ways to sort a `Geometry`.
@@ -4031,7 +4031,7 @@ def isc_tile(isc, n):
 
     def a2transpose(self,
                     atoms1: AtomsArgument,
-                    atoms2: Optional[AtomsArgument]=None) -> tuple[ndarray, ndarray]:
+                    atoms2: Optional[AtomsArgument]=None) -> Tuple[ndarray, ndarray]:
         """Transposes connections from `atoms1` to `atoms2` such that supercell connections are transposed
 
         When handling supercell indices it is useful to get the *transposed* connection. I.e. if you have
@@ -4095,7 +4095,7 @@ def a2transpose(self,
 
     def o2transpose(self,
                     orb1: OrbitalsArgument,
-                    orb2: Optional[OrbitalsArgument]=None) -> tuple[ndarray, ndarray]:
+                    orb2: Optional[OrbitalsArgument]=None) -> Tuple[ndarray, ndarray]:
         """ Transposes connections from `orb1` to `orb2` such that supercell connections are transposed
 
         When handling supercell indices it is useful to get the *transposed* connection. I.e. if you have
@@ -4639,7 +4639,7 @@ def within_inf(self,
                    lattice: Lattice,
                    periodic=None,
                    tol: float=1e-5,
-                   origin=None) -> tuple[ndarray, ndarray, ndarray]:
+                   origin=None) -> Tuple[ndarray, ndarray, ndarray]:
         """ Find all atoms within a provided supercell
 
         Note this function is rather different from `close` and `within`.