diff --git a/README.md b/README.md
index a7e00ab..dc10381 100644
--- a/README.md
+++ b/README.md
@@ -103,10 +103,11 @@ what matters.
 
 ## Branches
 
-| Moodle version    | Branch           | PHP  | Excimer    |
-|-------------------|------------------|------|------------|
-| Moodle 3.5+       | MOODLE_35_STABLE | 7.1+ | 1.0.2+     |
-| Totara 10+        | MOODLE_35_STABLE | 7.1+ | 1.0.2+     |
+| Moodle version    | Branch           | PHP   | Excimer    |
+|-------------------|------------------|-------|------------|
+| Moodle 4.3+       | MOODLE_403_STABLE | 8.1  | 2024110100 |
+| Moodle 3.5+       | MOODLE_35_STABLE  | 7.1+ | 1.0.2+     |
+| Totara 10+        | MOODLE_35_STABLE  | 7.1+ | 1.0.2+     |
 
 ## Installation
 
diff --git a/classes/local/hooks/after_config.php b/classes/local/hooks/after_config.php
new file mode 100644
index 0000000..faf8568
--- /dev/null
+++ b/classes/local/hooks/after_config.php
@@ -0,0 +1,65 @@
+<?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 tool_excimer\local\hooks;
+
+use tool_excimer\manager;
+
+/**
+ * Class after_config
+ *
+ * @package   tool_excimer
+ * @author    Sumaiya Javed <sumaiya.javed@catalyst.net.nz>
+ * @copyright 2024, Catalyst IT
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class after_config {
+
+    /**
+     * Hook to be run after initial site config.
+     *
+     * This allows the plugin to selectively activate the ExcimerProfiler while
+     * having access to the database. If the site does not have the MDL-75014
+     * available then the timer will be started at this point. It means that
+     * the initialisation of the request up to this point will not be captured
+     * by the profiler. This eliminates the need for an
+     * auto_prepend_file/auto_append_file.
+     *
+     * See also https://docs.moodle.org/dev/Login_callbacks#after_config.
+     *
+     * @param \core\hook\after_config $hook
+     * return void
+     */
+    public static function callback(\core\hook\after_config $hook): void {
+
+        global $CFG;
+
+        if (during_initial_install() || isset($CFG->upgraderunning)) {
+            // Do nothing during installation or upgrade.
+            return;
+        }
+
+        try {
+            // Start processor.
+            $manager = manager::get_instance();
+            $manager->start_processor();
+        } catch (\Exception $exception) {
+            debugging('tool_excimer_after_config error',
+            DEBUG_DEVELOPER, $exception->getTrace());
+        }
+
+    }
+}
diff --git a/db/hooks.php b/db/hooks.php
new file mode 100644
index 0000000..09f3522
--- /dev/null
+++ b/db/hooks.php
@@ -0,0 +1,35 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Hook callbacks for tool_excimer
+ *
+ * @package   tool_excimer
+ * @author    Sumaiya Javed <sumaiya.javed@catalyst.net.nz>
+ * @copyright 2024, Catalyst IT
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+$callbacks = [
+    [
+        'hook' => \core\hook\after_config::class,
+        'callback' => 'tool_excimer\local\hooks\after_config::callback',
+        'priority' => 0,
+    ],
+];
+
diff --git a/lib.php b/lib.php
index f766b67..f7cab13 100644
--- a/lib.php
+++ b/lib.php
@@ -37,23 +37,6 @@ function tool_excimer_before_session_start() {
     $manager = manager::get_instance();
 }
 
-/**
- * Hook to be run after initial site config.
- *
- * This allows the plugin to selectively activate the ExcimerProfiler while
- * having access to the database. If the site does not have the MDL-75014 available, then the timer will be
- * started at this point. It means that the initialisation of the
- * request up to this point will not be captured by the profiler. This
- * eliminates the need for an auto_prepend_file/auto_append_file.
- *
- * See also https://docs.moodle.org/dev/Login_callbacks#after_config.
- */
-function tool_excimer_after_config(): void {
-    // Start processor.
-    $manager = manager::get_instance();
-    $manager->start_processor();
-}
-
 /**
  * Hook to obtain a list of perfomence checks supplied by the plugin.
  *
diff --git a/version.php b/version.php
index 0018c95..d2c196a 100644
--- a/version.php
+++ b/version.php
@@ -25,13 +25,11 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version = 2024091600;
-$plugin->release = 2024091600;
-$plugin->requires = 2017051500;    // Moodle 3.3 for Totara support.
-$plugin->supported = [35, 401];     // Supports Moodle 3.5 or later.
-// TODO $plugin->incompatible = ;  // Available as of Moodle 3.9.0 or later.
-
+$plugin->version = 2024110100;
+$plugin->release = 2024110100;
+$plugin->requires  = 2023100900; // Moodle 4.3.
+$plugin->supported = [403, 405];
 $plugin->component = 'tool_excimer';
 $plugin->maturity  = MATURITY_STABLE;
-
 $plugin->dependencies = [];
+