Index: setup.py
--- setup.py.orig
+++ setup.py
@@ -8,7 +8,7 @@ from datetime import date
 from distutils.command.build import build
 from typing import List
 
-from pkg_resources.extern.packaging.version import Version
+from packaging.version import Version
 
 # a version must be PEP 440 compliant
 __version__ = Version("1.1.1")
