diff --git a/model_signing/serialization/serialize_by_file_shard.py b/model_signing/serialization/serialize_by_file_shard.py
index 4ebb318f..c16c1fdd 100644
--- a/model_signing/serialization/serialize_by_file_shard.py
+++ b/model_signing/serialization/serialize_by_file_shard.py
@@ -18,7 +18,7 @@
 import base64
 import concurrent.futures
 import pathlib
-from typing import Callable, Iterable, TypeAlias, cast
+from typing import Callable, Iterable, cast
 from typing_extensions import override
 
 from model_signing.hashing import file