diff --git a/setup.py b/setup.py
index cd3fbf4d..bad2348b 100644
--- a/setup.py
+++ b/setup.py
@@ -44,6 +44,7 @@ def get_version(version_tuple):
     author_email="ross.lawley@gmail.com",
     zip_safe=False,
     platforms="any",
+    python_requires=">=3.6",
     install_requires=[
         "Flask>=1.1.2",
         "WTForms[email]>=2.3.1",