diff --git a/src/llmtuner/data/utils.py b/src/llmtuner/data/utils.py
index 29fd4ad4..aaa5bdc0 100644
--- a/src/llmtuner/data/utils.py
+++ b/src/llmtuner/data/utils.py
@@ -1,6 +1,5 @@
-import hashlib
 from enum import Enum, unique
-from typing import TYPE_CHECKING, Dict, List, Optional, Tuple, Union
+from typing import TYPE_CHECKING, Dict, List, Tuple, Union
 
 from datasets import concatenate_datasets, interleave_datasets