diff --git a/classes/hook_callbacks.php b/classes/hook_callbacks.php
new file mode 100644
index 0000000..c6688e6
--- /dev/null
+++ b/classes/hook_callbacks.php
@@ -0,0 +1,41 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace auth_outage;
+
+use auth_outage\local\outagelib;
+use core\hook\output\before_standard_top_of_body_html_generation;
+
+/**
+ * Hook callbacks for auth_outage.
+ *
+ * @package   auth_outage
+ * @author    Benjamin Walker (benjaminwalker@catalyst-au.net)
+ * @copyright 2024 Catalyst IT
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class hook_callbacks {
+
+    /**
+     * Inject the warning bar into the page if there is currently an outage.
+     *
+     * @param before_standard_top_of_body_html_generation $hook
+     */
+    public static function before_standard_top_of_body_html_generation(before_standard_top_of_body_html_generation $hook): void {
+        // Get code to inject.
+        $hook->add_html(outagelib::get_inject_code());
+    }
+}
diff --git a/db/hooks.php b/db/hooks.php
new file mode 100644
index 0000000..087e3f9
--- /dev/null
+++ b/db/hooks.php
@@ -0,0 +1,34 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Hook callbacks for auth_outage
+ *
+ * @package   auth_outage
+ * @author    Benjamin Walker (benjaminwalker@catalyst-au.net)
+ * @copyright 2024 Catalyst IT
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+$callbacks = [
+    [
+        'hook' => \core\hook\output\before_standard_top_of_body_html_generation::class,
+        'callback' => [\auth_outage\hook_callbacks::class, 'before_standard_top_of_body_html_generation'],
+        'priority' => 0,
+    ],
+];
diff --git a/lib.php b/lib.php
index cc95564..91d6eb1 100644
--- a/lib.php
+++ b/lib.php
@@ -68,6 +68,9 @@ function auth_outage_get_climaintenance_resource_file($file) {
 /**
  * Inject the warning bar into the page if there is currently an outage.
  *
+ * This is a legacy callback that is used for compatibility with older Moodle versions.
+ * Moodle 4.4+ will use auth_outage\hook_callbacks::before_standard_top_of_body_html_generation instead.
+ *
  * @return string|void
  */
 function auth_outage_before_standard_top_of_body_html() {
diff --git a/version.php b/version.php
index 801be6d..84dc160 100644
--- a/version.php
+++ b/version.php
@@ -28,8 +28,8 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = "auth_outage";
-$plugin->version = 2023012700;                  // The current plugin version (Date: YYYYMMDDXX).
-$plugin->release = 2023012700;                  // Human-readable release information.
+$plugin->version = 2024052000;                  // The current plugin version (Date: YYYYMMDDXX).
+$plugin->release = 2024052000;                  // Human-readable release information.
 $plugin->requires = 2017111309;                 // 2017111309 = T13, but this really requires 3.9 and higher.
 $plugin->maturity = MATURITY_STABLE;            // Suitable for PRODUCTION environments!
-$plugin->supported = [39, 401];                 // A range of branch numbers of supported moodle versions.
+$plugin->supported = [39, 404];                 // A range of branch numbers of supported moodle versions.