diff --git a/debian/control b/debian/control
index 3e7fc44..f85b0fa 100644
--- a/debian/control
+++ b/debian/control
@@ -1,18 +1,18 @@
 Source: swh-model
 Maintainer: Software Heritage developers <swh-devel@inria.fr>
 Section: python
 Priority: optional
 Build-Depends: debhelper (>= 9),
                dh-python,
                python3-all,
                python3-nose,
                python3-setuptools,
-               python3-pyblake2,
+               python3 (>= 3.5) | python3-pyblake2,
                python3-vcversioner
 Standards-Version: 3.9.6
 Homepage: https://forge.softwareheritage.org/diffusion/DMOD/
 
 Package: python3-swh.model
 Architecture: all
 Depends: ${misc:Depends}, ${python3:Depends}
 Description: Software Heritage data model