diff --git a/setup.py b/setup.py
index aee90a8dc0..e2558875fc 100644
--- a/setup.py
+++ b/setup.py
@@ -48,7 +48,7 @@ def read_requirements(path):
 setup(
 
     # Requirements
-    python_requires='>=3',
+    python_requires='>=3.9,<4',
     install_requires=INSTALL_REQUIRES,
     extras_require=EXTRAS,