diff --git a/setup.py b/setup.py
index 435b955827b..004575e28d4 100644
--- a/setup.py
+++ b/setup.py
@@ -171,6 +171,7 @@ setup(
         'xlsxwriter',
         'xlwt',
     ],
+    python_requires='>=3.5',
     extras_require={
         'SSL': ['pyopenssl'],
     },