diff --git a/tox.ini b/tox.ini
index 55e0a22..df133a4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -33,6 +33,7 @@ deps =
   quixote>=3,<3.2
   psycopg2-binary<2.9
   bleach
+  dnspython
   vobject
   pyproj
   django-ratelimit<3