diff --git a/act/io/arm.py b/act/io/arm.py
index 2bf0338246..05c9201a87 100644
--- a/act/io/arm.py
+++ b/act/io/arm.py
@@ -12,7 +12,7 @@
 import tempfile
 import urllib
 import warnings
-from datetime import datetime, timedelta
+from datetime import datetime, timezone
 from os import PathLike
 from pathlib import Path, PosixPath