diff --git a/setup.py b/setup.py
index 38698763..39375912 100644
--- a/setup.py
+++ b/setup.py
@@ -12,6 +12,8 @@
     # test for 2.7-included packages, add to requirements if not available
     install_requires = ['six', 'python-dateutil>=2.7']
 
+    python_requires='>=3.6'
+
     # Additional dependencies from requirements.txt that should be installed
     # for full mtools feature support. These are optional dependencies to
     # simplify the default install experience, particularly where a build