diff --git a/debian/control b/debian/control
index 6a6a31a6383938172c9a53c749e063d52bd9ab9c..d9be9e343f0835fa8d850778613a9201743031c9 100644
--- a/debian/control
+++ b/debian/control
@@ -7,6 +7,7 @@ Build-Depends: debhelper (>= 9),
                python3 (>= 3.5) | python3-pyblake2,
                python3-all,
                python3-attr,
+               python3-attr-strict,
                python3-click,
                python3-dulwich,
                python3-iso8601,