diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 678afdd..0c30d42 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -24,7 +24,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
         environment-file: ["environment.yaml"]
     defaults:
       run:
diff --git a/pyproject.toml b/pyproject.toml
index ece543f..e4a7c2f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ dependencies = [
     "xarray",
     "pystac>=1.0.1",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 description = "Extend xarray.open_dataset to accept pystac objects"
 license = {text = "MIT"}
 readme = "README.md"
diff --git a/tests/utils.py b/tests/utils.py
index 13fce99..a534ec9 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -1,5 +1,4 @@
 import importlib
-from typing import Optional
 
 import pytest
 from packaging.version import Version
@@ -7,7 +6,7 @@
 
 # Copied from https://github.com/zarr-developers/VirtualiZarr/blob/9c3d0f90cc79fa20fe33833e244ae28a1ee91f17/virtualizarr/tests/__init__.py#L17-L34
 def _importorskip(
-    modname: str, minversion: Optional[str] = None
+    modname: str, minversion: str | None = None
 ) -> tuple[bool, pytest.MarkDecorator]:
     try:
         mod = importlib.import_module(modname)
diff --git a/xpystac/core.py b/xpystac/core.py
index 8f22e2d..d01102f 100644
--- a/xpystac/core.py
+++ b/xpystac/core.py
@@ -1,5 +1,6 @@
 import functools
-from typing import List, Literal, Mapping, Union
+from collections.abc import Mapping
+from typing import Literal
 
 import pystac
 import xarray
@@ -10,7 +11,7 @@
 @functools.singledispatch
 def to_xarray(
     obj,
-    stacking_library: Union[Literal["odc.stac", "stackstac"], None] = None,
+    stacking_library: Literal["odc.stac", "stackstac"] | None = None,
     **kwargs,
 ) -> xarray.Dataset:
     """Given a PySTAC object return an xarray dataset.
@@ -43,9 +44,9 @@ def to_xarray(
 @to_xarray.register(pystac.Item)
 @to_xarray.register(pystac.ItemCollection)
 def _(
-    obj: Union[pystac.Item, pystac.ItemCollection],
-    drop_variables: Union[str, List[str], None] = None,
-    stacking_library: Union[Literal["odc.stac", "stackstac"], None] = None,
+    obj: pystac.Item | pystac.ItemCollection,
+    drop_variables: str | list[str] | None = None,
+    stacking_library: Literal["odc.stac", "stackstac"] | None = None,
     **kwargs,
 ) -> xarray.Dataset:
     if drop_variables is not None:
@@ -86,7 +87,7 @@ def _(
 @to_xarray.register
 def _(
     obj: pystac.Asset,
-    stacking_library: Union[Literal["odc.stac", "stackstac"], None] = None,
+    stacking_library: Literal["odc.stac", "stackstac"] | None = None,
     **kwargs,
 ) -> xarray.Dataset:
     default_kwargs: Mapping = {"chunks": {}}
diff --git a/xpystac/xarray_plugin.py b/xpystac/xarray_plugin.py
index 2d625c6..bad8870 100644
--- a/xpystac/xarray_plugin.py
+++ b/xpystac/xarray_plugin.py
@@ -1,4 +1,5 @@
-from typing import Any, Iterable, Literal, Union
+from collections.abc import Iterable
+from typing import Any, Literal
 
 import pystac
 from xarray.backends import BackendEntrypoint
@@ -15,8 +16,8 @@ class STACBackend(BackendEntrypoint):
     def open_dataset(
         self,
         filename_or_obj: Any,
-        drop_variables: Union[str, Iterable[str], None] = None,
-        stacking_library: Union[Literal["odc.stac", "stackstac"], None] = None,
+        drop_variables: str | Iterable[str] | None = None,
+        stacking_library: Literal["odc.stac", "stackstac"] | None = None,
         **kwargs,
     ):
         """Given a PySTAC object return an xarray dataset