diff --git a/wfdb/io/_header.py b/wfdb/io/_header.py
index 8e53ba14..72e0aee0 100644
--- a/wfdb/io/_header.py
+++ b/wfdb/io/_header.py
@@ -1,5 +1,4 @@
 import datetime
-from dateutil import parser
 from typing import Any, Dict, List, Optional, Sequence, Tuple
 
 import numpy as np