diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -42,6 +42,7 @@
     description="Software Heritage core utilities",
     long_description=long_description,
     long_description_content_type="text/markdown",
+    python_requires=">=3.7",
     author="Software Heritage developers",
     author_email="swh-devel@inria.fr",
     url="https://forge.softwareheritage.org/diffusion/DCORE/",