diff --git a/setup.py b/setup.py
index b093d75..4d44c40 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,7 @@ setup(
     ],
     keywords='transportation, dynamic traffic assignment, metropolis',
     packages=['metrosim'],
-    python_requires='>=3.9, <4',
+    python_requires='>=3.5, <4',
     install_requires=[
         'numpy',
     ],