diff --git a/docs/development.rst b/docs/development.rst
index 61edd20f70e607c84e8923ea0d889a8430a89b82..a2359cf3e8aa69b4bb8952f3fafd6ee24d802e75 100644
--- a/docs/development.rst
+++ b/docs/development.rst
@@ -398,7 +398,7 @@ 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
-   10 Buster* or *Debian 11 Bullseye*.
+   11 Bullseye*.
 
 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
diff --git a/docs/releasenotes.rst b/docs/releasenotes.rst
index a89cb0483a48e910d9b9df3612a0413cef0703ee..74712fc7f03990d9ed3ce78e08ae5473e32de9ff 100644
--- a/docs/releasenotes.rst
+++ b/docs/releasenotes.rst
@@ -5,6 +5,14 @@ Release notes
 x.y.z
 -----
 
+Dropped support for Debian 10 (Buster).
+
+**Breaking changes:**
+
+* All roles
+
+  * Dropped support for Debian 10 (Buster).
+
 **Bug fixes:**
 
 * ``common`` role