diff --git a/setup.py b/setup.py
index 0e40fe1..ff7f756 100644
--- a/setup.py
+++ b/setup.py
@@ -13,6 +13,9 @@ setuptools.setup(
     long_description_content_type="text/markdown",
     url="https://marceln.org/git/Werk/lmwsip",
     packages=setuptools.find_packages(),
+    install_requires=[
+      'python-dateutil',
+    ],
     classifiers=[
         "Programming Language :: Python :: 3",
         "License :: TODO",