diff --git a/darwin/dataset/local_dataset.py b/darwin/dataset/local_dataset.py
index db860e245..4645110c7 100644
--- a/darwin/dataset/local_dataset.py
+++ b/darwin/dataset/local_dataset.py
@@ -1,7 +1,6 @@
 import multiprocessing as mp
 from pathlib import Path
 from typing import Any, Dict, Iterator, List, Optional, Tuple
-from xmlrpc.client import Boolean
 
 import numpy as np
 from PIL import Image as PILImage
@@ -68,7 +67,7 @@ def __init__(
         split: str = "default",
         split_type: str = "random",
         release_name: Optional[str] = None,
-        keep_empty_annotations: Boolean = False,
+        keep_empty_annotations: bool = False,
     ):
         self.dataset_path = dataset_path
         self.annotation_type = annotation_type
@@ -134,7 +133,7 @@ def _setup_annotations_and_images(
         split,
         partition,
         split_type,
-        keep_empty_annotations=False,
+        keep_empty_annotations: bool = False,
     ):
         # Find all the annotations and their corresponding images
         for annotation_path in sorted(annotations_dir.glob("**/*.json")):
diff --git a/darwin/datatypes.py b/darwin/datatypes.py
index 4ea553e73..b0a28d1c8 100644
--- a/darwin/datatypes.py
+++ b/darwin/datatypes.py
@@ -14,7 +14,6 @@
     Tuple,
     Union,
 )
-from xmlrpc.client import Boolean
 
 try:
     from numpy.typing import NDArray
@@ -538,7 +537,7 @@ def make_polygon(
     bounding_box: Optional[Dict] = None,
     subs: Optional[List[SubAnnotation]] = None,
     slot_names: Optional[List[str]] = None,
-    darwin_v1: Boolean = False,
+    darwin_v1: bool = False,
 ) -> Annotation:
     """
     Creates and returns a polygon annotation.
diff --git a/tests/darwin/importer/formats/import_nifti_test.py b/tests/darwin/importer/formats/import_nifti_test.py
index 1ee2a537f..52cbe8a46 100644
--- a/tests/darwin/importer/formats/import_nifti_test.py
+++ b/tests/darwin/importer/formats/import_nifti_test.py
@@ -52,16 +52,18 @@ def test_image_annotation_nifti_import_single_slot(team_slug_darwin_json_v2: str
 
             expected_json_string = json.load(
                 open(
-                    Path(tmpdir) / team_slug_darwin_json_v2 / "nifti" / "vol0_annotation_file.json",
+                    Path(tmpdir)
+                    / team_slug_darwin_json_v2
+                    / "nifti"
+                    / "vol0_annotation_file.json",
                     "r",
                 )
             )
 
-            expected_output_frames = expected_json_string['annotations'][0]['frames']
-      
+            expected_output_frames = expected_json_string["annotations"][0]["frames"]
+
             assert (
-                output_json_string["annotations"][0]["frames"]
-                == expected_output_frames
+                output_json_string["annotations"][0]["frames"] == expected_output_frames
             )