diff --git a/stubs/python-dateutil/dateutil/parser/isoparser.pyi b/stubs/python-dateutil/dateutil/parser/isoparser.pyi
index bf589f592296..a28cbe8bd86a 100644
--- a/stubs/python-dateutil/dateutil/parser/isoparser.pyi
+++ b/stubs/python-dateutil/dateutil/parser/isoparser.pyi
@@ -2,8 +2,8 @@ from _typeshed import SupportsRead
 from datetime import date, datetime, time, tzinfo
 from typing import TypeAlias
 
-_Readable: TypeAlias = SupportsRead[str | bytes]
-_TakesAscii: TypeAlias = str | bytes | _Readable
+_Readable: TypeAlias = SupportsRead[str | bytes | bytearray]
+_TakesAscii: TypeAlias = str | bytes | bytearray | _Readable
 
 __all__ = ["isoparse", "isoparser"]