diff --git a/virtualizarr/tests/test_zarr.py b/virtualizarr/tests/test_zarr.py
index 6ba44c9b..9eda0440 100644
--- a/virtualizarr/tests/test_zarr.py
+++ b/virtualizarr/tests/test_zarr.py
@@ -7,7 +7,7 @@
 
 from virtualizarr import ManifestArray, open_virtual_dataset
 from virtualizarr.manifests.manifest import ChunkManifest
-from virtualizarr.zarr import dataset_to_zarr, metadata_from_zarr_json, ZArray
+from virtualizarr.zarr import ZArray, dataset_to_zarr, metadata_from_zarr_json
 
 
 @pytest.fixture
@@ -88,6 +88,7 @@ def test_replace_partial():
     assert result.shape == (2, 3)
     assert result.chunks == (2, 3)
 
+
 def test_replace_total():
     arr = ZArray(shape=(2, 3), chunks=(1, 1), dtype=np.dtype("<i8"))
     kwargs = dict(
@@ -102,4 +103,4 @@ def test_replace_total():
     )
     result = arr.replace(**kwargs)
     expected = ZArray(**kwargs)
-    assert result == expected
\ No newline at end of file
+    assert result == expected
diff --git a/virtualizarr/zarr.py b/virtualizarr/zarr.py
index 3f4de83b..dc24081b 100644
--- a/virtualizarr/zarr.py
+++ b/virtualizarr/zarr.py
@@ -4,10 +4,8 @@
 from typing import (
     TYPE_CHECKING,
     Any,
-    Dict,
     Literal,
     NewType,
-    Optional,
 )
 
 import numcodecs