diff --git a/tox.ini b/tox.ini
index 6db60c882..8c9aaaf26 100644
--- a/tox.ini
+++ b/tox.ini
@@ -70,6 +70,8 @@ deps =
     configargparse==0.10.0
     PyOpenSSL==0.13
     requests<=2.11.1
+    zope.component==4.0.2
+    zope.interface==4.0.5
 setenv =
     CERTBOT_NO_PIN=1