diff --git a/setup.py b/setup.py
index a0f3d056b619010d5b68cdb4178c4d63e2d7f524..6bc7b74adc3c4986749f248b239b5859ac1e3bb5 100644
--- a/setup.py
+++ b/setup.py
@@ -32,6 +32,7 @@ setup(name="pytato",
           'Topic :: Software Development :: Libraries',
           ],
 
+      python_requires="~=3.6",
       install_requires=[
           "loo.py",
           ],