diff --git a/setup.py b/setup.py
index 4c2b718dc4cf873e06b2b9c47845c7de5dd50d08..59dcb5c85c39006f335642f400b9f991778f985f 100644
--- a/setup.py
+++ b/setup.py
@@ -42,6 +42,7 @@ def main():
 
           packages=find_packages(),
 
+          python_requires="~=3.6",
           install_requires=[
               "pytest>=2.3",
               "pytools>=2018.5.2",