diff --git a/defaults/main.yml b/defaults/main.yml
index 53b4bc2..3451f3d 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -1,6 +1,6 @@
 ---
 cron_file: /etc/cron.d/zammad
-debian_version: buster
+debian_version: bullseye
 
 ruby_path: "{{ zammad_user_home }}/.rbenv"
 ruby_bin_path: "{{ ruby_path }}/versions/{{ ruby_version }}/bin"