diff --git a/vars/main.yml b/vars/main.yml
index 1550d44266b3aca6720c3a034b7c9568087c2349..0e296cded290078d7e7320b9235195f78e84591d 100644
--- a/vars/main.yml
+++ b/vars/main.yml
@@ -2,8 +2,10 @@ packages:
   pkg: {}
   repos:
     zammad:
-      url: "deb https://dl.packager.io/srv/deb/zammad/zammad/{{ zammad.release_channel }}/debian {{ ansible_distribution_major_version }} main"
+      url: "https://dl.packager.io/srv/deb/zammad/zammad/{{ zammad.release_channel }}/debian {{ ansible_distribution_major_version }} main"
       keyurl: "https://dl.packager.io/srv/zammad/zammad/key"
+      keychecksum: "sha256:35ee80b7fca522dc8f418e81ff20ae189e957f0216f1e47c29cca2cd5f0069e0"
+      keyarmored: true
 
 nginx:
   upstreams: