diff --git a/src/av2/datasets/tbv/splits.py b/src/av2/datasets/tbv/splits.py
index 358814b2..253274cb 100644
--- a/src/av2/datasets/tbv/splits.py
+++ b/src/av2/datasets/tbv/splits.py
@@ -1,4 +1,3 @@
 # <Copyright 2022, Argo AI, LLC. Released under the MIT license.>
 
 """Splits for the Trust, but Verify (Argoverse 2 Map Change) dataset."""
-
diff --git a/src/av2/utils/io.py b/src/av2/utils/io.py
index 5e024308..31a0be3d 100644
--- a/src/av2/utils/io.py
+++ b/src/av2/utils/io.py
@@ -206,7 +206,7 @@ def write_img(img_path: Path, img: NDArrayByte, channel_order: str = "RGB") -> N
     cv2.imwrite(str(img_path), img)
 
 
-def read_json_file(fpath: Path) -> Any:
+def read_json_file(fpath: Path) -> Dict[str, Any]:
     """Load dictionary from JSON file.
 
     Args:
@@ -216,7 +216,8 @@ def read_json_file(fpath: Path) -> Any:
         Deserialized Python dictionary.
     """
     with open(fpath, "rb") as f:
-        return json.load(f)
+        data: Dict[str, Any] = json.load(f)
+        return data
 
 
 def save_json_dict(