diff --git a/src/numpydantic/dtype.py b/src/numpydantic/dtype.py
index d25bcd1..5a292c5 100644
--- a/src/numpydantic/dtype.py
+++ b/src/numpydantic/dtype.py
@@ -14,7 +14,13 @@ Check these using ``in`` rather than ``==``. This interface will develop in futu
 versions to allow a single dtype check.
 """
 
-from typing import Tuple, TypeAlias, Union
+import sys
+from typing import Tuple, Union
+
+if sys.version_info.minor >= 10:
+    from typing import TypeAlias
+else:
+    from typing_extensions import TypeAlias
 
 import numpy as np
 
diff --git a/src/numpydantic/interface/hdf5.py b/src/numpydantic/interface/hdf5.py
index fcde4d4..67cecda 100644
--- a/src/numpydantic/interface/hdf5.py
+++ b/src/numpydantic/interface/hdf5.py
@@ -18,10 +18,10 @@ except ImportError:
 
 if sys.version_info.minor >= 10:
     from typing import TypeAlias
+else:
+    from typing_extensions import TypeAlias
 
-    H5Arraylike: TypeAlias = Tuple[Union[Path, str], str]
-else:  # pragma: no cover
-    H5Arraylike = Tuple[Union[Path, str], str]
+H5Arraylike: TypeAlias = Tuple[Union[Path, str], str]
 
 
 class H5ArrayPath(NamedTuple):
diff --git a/tests/conftest.py b/tests/conftest.py
index 46a9a49..c716dec 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -4,7 +4,7 @@ import sys
 import pytest
 from typing import Any, Tuple, Union, Type
 
-if sys.version_info.minor >= 11:
+if sys.version_info.minor >= 10:
     from typing import TypeAlias
 else:
     from typing_extensions import TypeAlias