diff --git a/buildbot/master/init.sls b/buildbot/master/init.sls
index 19285a9e..818fdf30 100644
--- a/buildbot/master/init.sls
+++ b/buildbot/master/init.sls
@@ -11,6 +11,7 @@ buildbot-master:
       - txgithub == 15.0.0
       - boto == 2.38.0
       - pyyaml == 3.11
+      - twisted == 16.6.0
     - require:
       - pkg: pip
   service.running: