diff --git a/docs/development.rst b/docs/development.rst
index 558f3bce66d044b8c553a5469dc10abc68f22fee..5013913dff8082fcae4518e4d5347fd8d58ec1d5 100644
--- a/docs/development.rst
+++ b/docs/development.rst
@@ -414,7 +414,7 @@ In order to deploy the test site, the following steps would normally be taken:
      ansible-playbook playbooks/preseed.yml
 
 9. Install all servers using the generated preseed files. Use *Debian
-   11 Bullseye*.
+   12 Bookworm*.
 
 10. Add the SSH host fingerprints to your ``known_hosts`` file (don't forget to
     remove old entries if you are redoing the process). You can easily obtain all