diff --git a/playbooks/security_updates.yml b/playbooks/security_updates.yml
new file mode 100644
index 0000000..9ce013d
--- /dev/null
+++ b/playbooks/security_updates.yml
@@ -0,0 +1,79 @@
+---
+- name: Apply security updates
+  hosts: wulf_security
+  become: true
+  serial: "{{ serial | default('100%') }}"
+
+  vars:
+    apprise_url: "http://apprise:8000"
+
+  tasks:
+    - name: Update apt cache
+      ansible.builtin.apt:
+        update_cache: yes
+        cache_valid_time: 0
+
+    - name: Ensure unattended-upgrades is installed
+      ansible.builtin.apt:
+        name: unattended-upgrades
+        state: present
+
+    - name: Apply security updates
+      ansible.builtin.command:
+        cmd: unattended-upgrade --verbose
+      register: upgrade_result
+      changed_when: "'Packages that will be upgraded' in upgrade_result.stdout"
+
+    - name: Check if reboot is required
+      ansible.builtin.stat:
+        path: /var/run/reboot-required
+      register: reboot_required_file
+
+    - name: Flag hosts requiring reboot
+      ansible.builtin.debug:
+        msg: "REBOOT REQUIRED: {{ inventory_hostname }} must be rebooted to complete updates"
+      when: reboot_required_file.stat.exists
+
+    - name: Record reboot status
+      ansible.builtin.set_fact:
+        reboot_needed: "{{ reboot_required_file.stat.exists }}"
+
+
+- name: Send Apprise notification
+  hosts: localhost
+  gather_facts: false
+
+  vars:
+    apprise_url: "http://apprise:8000"
+
+  tasks:
+    - name: Build list of hosts requiring reboot
+      ansible.builtin.set_fact:
+        hosts_needing_reboot: >-
+          {{
+            groups['wulf_security']
+            | select('in', hostvars)
+            | selectattr('reboot_needed', 'defined')
+            | selectattr('reboot_needed')
+            | list
+          }}
+
+    - name: Send completion notification
+      ansible.builtin.uri:
+        url: "{{ apprise_url }}/notify"
+        method: POST
+        body_format: json
+        status_code: [200, 204]
+        body:
+          title: "Security Updates Complete"
+          body: >-
+            Security updates applied to {{ groups['wulf_security'] | length }} host(s)
+            in the wulf_security group.
+            {%- if hosts_needing_reboot | length > 0 %}
+
+            Reboot required on: {{ hosts_needing_reboot | join(', ') }}
+            {%- else %}
+
+            No reboots required.
+            {%- endif %}
+          type: "{% if hosts_needing_reboot | length > 0 %}warning{% else %}success{% endif %}"
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