diff --git a/python/lib/sift_client/_internal/low_level_wrappers/upload.py b/python/lib/sift_client/_internal/low_level_wrappers/upload.py
index ba7e595f3..e1c9c6777 100644
--- a/python/lib/sift_client/_internal/low_level_wrappers/upload.py
+++ b/python/lib/sift_client/_internal/low_level_wrappers/upload.py
@@ -2,6 +2,7 @@
 
 import asyncio
 import logging
+import mimetypes
 from pathlib import Path
 from typing import TYPE_CHECKING, Any
 
@@ -16,6 +17,10 @@
 # Configure logging
 logger = logging.getLogger(__name__)
 
+# Parquet MIME types are not included in mimetypes by default
+mimetypes.add_type("application/vnd.apache.parquet", ".pqt")
+mimetypes.add_type("application/vnd.apache.parquet", ".parquet")
+
 
 class UploadLowLevelClient(LowLevelClientBase, WithRestClient):
     """Low-level client for file upload operations.
@@ -182,7 +187,6 @@ def _mime_and_content_type_from_path(path: Path) -> tuple[str, str | None, str |
         Returns:
             A tuple of (file_name, mime_type, content_encoding).
         """
-        import mimetypes
 
         file_name = path.name
         mime, encoding = mimetypes.guess_type(path)
diff --git a/python/lib/sift_client/_tests/_internal/low_level_wrappers/test_upload.py b/python/lib/sift_client/_tests/_internal/low_level_wrappers/test_upload.py
new file mode 100644
index 000000000..d40fd9aec
--- /dev/null
+++ b/python/lib/sift_client/_tests/_internal/low_level_wrappers/test_upload.py
@@ -0,0 +1,16 @@
+"""Tests for UploadLowLevelClient functionality."""
+
+from pathlib import Path
+
+from sift_client._internal.low_level_wrappers.upload import UploadLowLevelClient
+
+
+class TestUploadLowLevelClient:
+    class TestMimeAndContentTypeFromPath:
+        def test_parquet_file_extension(self):
+            _, mime, _ = UploadLowLevelClient._mime_and_content_type_from_path(Path("data.parquet"))
+            assert mime == "application/vnd.apache.parquet"
+
+        def test_pqt_file_extension(self):
+            _, mime, _ = UploadLowLevelClient._mime_and_content_type_from_path(Path("data.pqt"))
+            assert mime == "application/vnd.apache.parquet"