diff --git a/debian/control b/debian/control
index 4a3c011..e0e2036 100644
--- a/debian/control
+++ b/debian/control
@@ -46,7 +46,7 @@ Build-Depends:
  python3-requests-mock,
  python3-requests-toolbelt,
  python3-setuptools,
- python3-six,
+ python3-six (>= 1.9.0-3~),
  python3-tz,
 Standards-Version: 4.0.1
 Homepage: https://github.com/mvantellingen/python-zeep