diff --git a/m3u8/parser.py b/m3u8/parser.py
index 3f511e3c..55e56e6b 100644
--- a/m3u8/parser.py
+++ b/m3u8/parser.py
@@ -3,12 +3,17 @@
 # Use of this source code is governed by a MIT License
 # license that can be found in the LICENSE file.
 
-import datetime
 import itertools
 import re
+from datetime import datetime, timedelta
 from urllib.parse import urljoin as _urljoin
 
-import iso8601
+try:
+    from backports.datetime_fromisoformat import MonkeyPatch
+    MonkeyPatch.patch_fromisoformat()
+except ImportError:
+    pass
+
 
 from m3u8 import protocol
 
@@ -20,7 +25,7 @@
 
 
 def cast_date_time(value):
-    return iso8601.parse_date(value)
+    return datetime.fromisoformat(value)
 
 
 def format_date_time(value, **kwargs):
@@ -287,7 +292,7 @@ def _parse_ts_chunk(line, data, state):
         segment["program_date_time"] = state.pop("program_date_time")
     if state.get("current_program_date_time"):
         segment["current_program_date_time"] = state["current_program_date_time"]
-        state["current_program_date_time"] += datetime.timedelta(
+        state["current_program_date_time"] += timedelta(
             seconds=segment["duration"]
         )
     segment["uri"] = line
@@ -575,7 +580,7 @@ def _parse_part(line, data, state):
     # this should always be true according to spec
     if state.get("current_program_date_time"):
         part["program_date_time"] = state["current_program_date_time"]
-        state["current_program_date_time"] += datetime.timedelta(
+        state["current_program_date_time"] += timedelta(
             seconds=part["duration"]
         )
 
diff --git a/requirements.txt b/requirements.txt
index 57c80f08..c785d132 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-iso8601
+backports-datetime-fromisoformat; python_version < '3.11'
diff --git a/setup.py b/setup.py
index d9a95375..f1c01d4a 100644
--- a/setup.py
+++ b/setup.py
@@ -23,5 +23,5 @@
     url="https://github.com/globocom/m3u8",
     description="Python m3u8 parser",
     long_description=long_description,
-    python_requires=">=3.6",
+    python_requires=">=3.7",
 )