diff --git a/setup.cfg b/setup.cfg
index f3c0032467..3fa5f96799 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -8,3 +8,6 @@ url=https://github.com/cta-observatory/cta-lstchain
 long_description = file: README.md
 long_description_content_type = text/markdown
 github_project = cta-observatory/cta-lstchain
+
+[options]
+python_requires = >=3.6