diff --git a/m3u8/parser.py b/m3u8/parser.py
index 5fceccfa..07f9ac83 100644
--- a/m3u8/parser.py
+++ b/m3u8/parser.py
@@ -9,9 +9,10 @@
 from urllib.parse import urljoin as _urljoin
 
 try:
-    from iso8601 import parse_date
+    from backports.datetime_fromisoformat import MonkeyPatch
+    MonkeyPatch.patch_fromisoformat()
 except ImportError:
-    parse_date = datetime.datetime.fromisoformat
+    pass
 
 
 from m3u8 import protocol
@@ -24,7 +25,7 @@
 
 
 def cast_date_time(value):
-    return parse_date(value)
+    return datetime.datetime.fromisoformat(value)
 
 
 def format_date_time(value, **kwargs):
diff --git a/requirements.txt b/requirements.txt
index f2d13e13..c785d132 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-iso8601; python_version < '3.11'
+backports-datetime-fromisoformat; python_version < '3.11'