diff --git a/docs/ansible_detailed.rst b/docs/ansible_detailed.rst
index 703e9b4b..06aa4955 100644
--- a/docs/ansible_detailed.rst
+++ b/docs/ansible_detailed.rst
@@ -1018,6 +1018,8 @@ Like the :ans:conn:`ssh` except connection delegation is supported.
 * ``ansible_ssh_private_key_file``
 * ``ansible_ssh_pass``, ``ansible_ssh_password``, ``ansible_password``
   (default: assume passwordless)
+* ``ansible_ssh_host_key_checking``, ``ansible_host_key_checking`` (default: 
+  :data:`True`)
 * ``ssh_args``, ``ssh_common_args``, ``ssh_extra_args``
 * ``mitogen_mask_remote_name``: if :data:`True`, mask the identity of the
   Ansible controller process on remote machines. To simplify diagnostics,
diff --git a/docs/changelog.rst b/docs/changelog.rst
index e1c54df1..6832d54f 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -33,6 +33,12 @@ Ansible + Mitogen will still work for now. Mitogen is considering alternatives
 to strategy plugins under :gh:issue:`1278`.
 
 
+v0.3.25b1 (2025-07-21)
+----------------------
+
+* :gh:issue:`1303` CI: Switch to archived Debian 10 (buster) apt repository
+
+
 v0.3.25a3 (2025-07-02)
 ----------------------
 
diff --git a/tests/ansible/hosts/group_vars/debian10.yml b/tests/ansible/hosts/group_vars/debian10.yml
new file mode 100644
index 00000000..c6c0a268
--- /dev/null
+++ b/tests/ansible/hosts/group_vars/debian10.yml
@@ -0,0 +1,4 @@
+package_manager_repos:
+  - dest: /etc/apt/sources.list
+    content: |
+      deb http://archive.debian.org/debian buster main contrib non-free