diff --git a/setup.cfg b/setup.cfg
index ebaa2cc..998a23d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -9,11 +9,12 @@ keywords = PDS, PDS4, archive, data
 [options]
 zip_safe = False
 include_package_data = True
+python_requires = >=3.7
+
 packages = find:
 install_requires =
     pandas
     pyyaml
     lxml
     pds4-tools
-    python_version >= 3.7