diff --git a/pretalx.yml b/pretalx.yml
index c576bef..021907e 100644
--- a/pretalx.yml
+++ b/pretalx.yml
@@ -12,6 +12,7 @@
       package:
         name: 
           - acl
+          - cron
           - nginx
           - python3-pip
         state: latest