diff --git a/setup.py b/setup.py
index e2c403a9bb3..dd8cfce794e 100755
--- a/setup.py
+++ b/setup.py
@@ -49,6 +49,7 @@
       packages=find_packages(),
       version=package.version.get_version(pep440=True),
       description=DESCRIPTION,
+      python_requires='>=3.6',
       # these should be minimum list of what is needed to run (note
       # don't need to list the sub-dependencies like numpy, since
       # astropy already depends on it)