diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7ad1ca6..51a401d 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Redirect Changelog
+## 2.0.0 - 2022-06-24
+### Changed
+- Make compatible with Craft 4.0
+- Make compatible php 8.0
+
 ## 1.1.1 - 2020-08-06
+
 ### Fixed
 - Fixed plugin name in Composer to be in line with the plugin store
 
diff --git a/INSTALL.md b/INSTALL.md
index ee15c3d..ee06d55 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -2,7 +2,7 @@
 
 ## Requirements
 
-This plugin requires Craft CMS 3.0.14 or later.
+This plugin requires Craft CMS 4.0 or later.
 
 ## Installation
 
diff --git a/README.md b/README.md
index 3041309..319d650 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Craft CMS 3.x Redirect Manager
+# Craft CMS 4.x Redirect Manager
 
 Craft plugin that provides an easy way to enter and maintain 301 and 302 redirects. The plugin provides a clear user interface for admin and non-admin users.
 
@@ -11,7 +11,7 @@ As a new (experimental) feature the redirect also give you the ability to enable
 **Note**: This plugin may become a paid add-on when the Craft Plugin store becomes available.
 
 ## Requirements
-This plugin requires Craft CMS 3.4 or later.
+This plugin requires Craft CMS 4.0 or later.
 
 ## Installation
 
diff --git a/composer.json b/composer.json
index e687bd1..efb21f4 100755
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
   "name": "dolphiq/redirect",
   "description": "Craft redirect plugin provides an easy way to enter and maintain 301 and 302 redirects and 404 error pages.",
   "type": "craft-plugin",
-  "version": "1.1.1",
+  "version": "2.0.0",
   "keywords": [
     "craft",
     "cms",
@@ -12,6 +12,9 @@
     "seo",
     "craft3"
   ],
+  "platform": {
+    "php": "8.0|8.1"
+  },
   "license": "MIT",
   "support": {
     "docs": "https://github.com/Dolphiq/craft3-plugin-redirect/blob/master/README.md",
@@ -22,15 +25,10 @@
       "name": "Dolphiq",
       "email": "info@dolphiq.nl",
       "homepage": "https://dolphiq.nl/"
-    },
-    {
-      "name": "RJ Hallsted",
-      "email": "rjhallsted@gmail.com",
-      "homepage": "https://github.com/rjhallsted/"
     }
   ],
   "require": {
-    "craftcms/cms": "^3.0.14"
+    "craftcms/cms": "^4.0.0"
   },
   "autoload": {
     "psr-4": {
diff --git a/src/RedirectPlugin.php b/src/RedirectPlugin.php
index 61da4fb..0fd4a6d 100644
--- a/src/RedirectPlugin.php
+++ b/src/RedirectPlugin.php
@@ -11,16 +11,21 @@
 namespace dolphiq\redirect;
 
 use Craft;
+use craft\base\Plugin;
+use craft\events\RegisterUrlRulesEvent;
+use craft\feedme\events\RegisterFeedMeElementsEvent;
+use craft\feedme\Plugin as FeedmePlugin;
+use craft\feedme\services\Elements as FeedmeElements;
+use craft\helpers\UrlHelper;
+use craft\web\UrlManager;
 use dolphiq\redirect\elements\FeedMeRedirect;
 use dolphiq\redirect\models\Settings;
-use dolphiq\redirect\services\Redirects;
 use dolphiq\redirect\services\CatchAll;
-use craft\events\RegisterUrlRulesEvent;
-use craft\web\UrlManager;
+use dolphiq\redirect\services\Redirects;
 use yii\base\Event;
+use yii\web\Response;
 
-
-class RedirectPlugin extends \craft\base\Plugin
+class RedirectPlugin extends Plugin
 {
     public static $plugin;
 
@@ -30,7 +35,7 @@ class RedirectPlugin extends \craft\base\Plugin
     /**
      * Returns the Redirects service.
      *
-     * @return \dolphiq\redirect\services\Redirects The Redirects service
+     * @return Redirects The Redirects service
      */
     public function getRedirects()
     {
@@ -50,11 +55,11 @@ public function getCatchAll()
         return $this->_catchAallService;
     }
 
-    public $hasCpSection = true;
-    public $hasCpSettings = true;
+    public bool $hasCpSection = true;
+    public bool $hasCpSettings = true;
 
     // table schema version
-    public $schemaVersion = '1.0.5';
+    public string $schemaVersion = '1.0.5';
 
     /*
     *
@@ -62,7 +67,7 @@ public function getCatchAll()
     *  The getCpNavItem was found in the source and will check the user privilages already.
     *
     */
-    public function getCpNavItem()
+    public function getCpNavItem(): array
     {
         return [
             'url' => 'redirect',
@@ -82,10 +87,10 @@ protected function createSettingsModel(): Settings
      *
      */
 
-    public function getSettingsResponse()
+    public function getSettingsResponse(): Response
     {
-        $url = \craft\helpers\UrlHelper::cpUrl('settings/redirect/settings');
-        return \Craft::$app->controller->redirect($url);
+        $url = UrlHelper::cpUrl('settings/redirect/settings');
+        return Craft::$app->controller->redirect($url);
     }
 
     /**
@@ -97,7 +102,7 @@ public function getSettingsResponse()
     public function registerCpUrlRules(RegisterUrlRulesEvent $event)
     {
         // only register CP URLs if the user is logged in
-        if (!\Craft::$app->user->identity)
+        if (!Craft::$app->user->identity)
             return;
         $rules = [
             // register routes for the sub nav
@@ -137,8 +142,8 @@ public function registerCpUrlRules(RegisterUrlRulesEvent $event)
      */
     private function registerFeedMeElement()
     {
-        if (Craft::$app->plugins->isPluginEnabled('feed-me') && class_exists(\craft\feedme\Plugin::class)) {
-            Event::on(\craft\feedme\services\Elements::class, \craft\feedme\services\Elements::EVENT_REGISTER_FEED_ME_ELEMENTS, function (\craft\feedme\events\RegisterFeedMeElementsEvent $e) {
+        if (Craft::$app->plugins->isPluginEnabled('feed-me') && class_exists(FeedmePlugin::class)) {
+            Event::on(FeedmeElements::class, FeedmeElements::EVENT_REGISTER_FEED_ME_ELEMENTS, function (RegisterFeedMeElementsEvent $e) {
                 $e->elements[] = FeedMeRedirect::class;
             });
         }
@@ -155,7 +160,7 @@ public function init()
         Event::on(UrlManager::class, UrlManager::EVENT_REGISTER_CP_URL_RULES, [$this, 'registerCpUrlRules']);
 
         // Register FeedMe ElementType
-       $this->registerFeedMeElement();
+        $this->registerFeedMeElement();
 
         $settings = RedirectPlugin::$plugin->getSettings();
         if ($settings->redirectsActive) {
@@ -188,7 +193,7 @@ public function init()
                         ];
                     }
 
-                    $event->rules = array_merge($activeRules ,$event->rules);
+                    $event->rules = array_merge($activeRules, $event->rules);
                 }
                 // 404?
 
diff --git a/src/controllers/RedirectController.php b/src/controllers/RedirectController.php
index f1bea3c..aaf4f10 100644
--- a/src/controllers/RedirectController.php
+++ b/src/controllers/RedirectController.php
@@ -23,7 +23,7 @@
 class RedirectController extends Controller
 {
     private $_sourceRouteParams = [];
-    protected $allowAnonymous = ['index'];
+    protected array|int|bool $allowAnonymous = ['index'];
 
     const EVENT_BEFORE_CATCHALL = 'beforeCatchall';
 
diff --git a/src/controllers/SettingsController.php b/src/controllers/SettingsController.php
index 63fec65..6f72e7b 100644
--- a/src/controllers/SettingsController.php
+++ b/src/controllers/SettingsController.php
@@ -10,15 +10,11 @@
 namespace dolphiq\redirect\controllers;
 
 use Craft;
-use craft\web\Controller;
 use craft\helpers\UrlHelper;
-
-use dolphiq\redirect\RedirectPlugin;
-use dolphiq\redirect\elements\Redirect;
-
 use craft\records\Element as ElementRecord;
-
-use craft\db\Query;
+use craft\web\Controller;
+use dolphiq\redirect\elements\Redirect;
+use dolphiq\redirect\RedirectPlugin;
 
 class SettingsController extends Controller
 {
@@ -186,7 +182,7 @@ public function actionSettings(): craft\web\Response
      *
      * @return Response
      */
-    public function actionSaveSettings(): craft\web\Response
+    public function actionSaveSettings(): ?craft\web\Response
     {
         $this->requirePostRequest();
         $this->requireAdmin();
@@ -219,7 +215,7 @@ public function actionSaveSettings(): craft\web\Response
 
         Craft::$app->getSession()->setNotice(Craft::t('app', 'Plugin settings saved.'));
 
-        return $this->redirectToPostedUrl($newSettings);
+        return $this->redirectToPostedUrl((object)$newSettings);
     }
 
     /**
@@ -335,8 +331,8 @@ public function actionSaveRedirect()
         }
 
         $elementRecord = ElementRecord::findOne($redirect->id);
-        if($elementRecord) {
-	        $redirect->uid = $elementRecord->uid;
+        if ($elementRecord) {
+            $redirect->uid = $elementRecord->uid;
         }
 
         $redirect->siteId = $siteId;
@@ -359,14 +355,14 @@ public function actionSaveRedirect()
 
             return null;
         } else {
-          // remove form other sites
-          Craft::$app->getDb()->createCommand()
-            ->delete('{{%elements_sites}}', [
-              'AND',
-              ['elementId' => $redirect->id],
-              ['!=', 'siteId', $siteId]
-            ])
-            ->execute();
+            // remove form other sites
+            Craft::$app->getDb()->createCommand()
+                ->delete('{{%elements_sites}}', [
+                    'AND',
+                    ['elementId' => $redirect->id],
+                    ['!=', 'siteId', $siteId]
+                ])
+                ->execute();
 
             if ($request->getAcceptsJson()) {
                 return $this->asJson([
diff --git a/src/elements/FeedMeRedirect.php b/src/elements/FeedMeRedirect.php
index 9c65bca..dbaba69 100644
--- a/src/elements/FeedMeRedirect.php
+++ b/src/elements/FeedMeRedirect.php
@@ -2,13 +2,11 @@
 
 namespace dolphiq\redirect\elements;
 
-use craft\feedme\Base\Element;
-use craft\feedme\Base\ElementInterface;
-
+use Cake\Utility\Hash;
 use Craft;
 use craft\base\Element as BaseElement;
-
-use Cake\Utility\Hash;
+use craft\feedme\Base\Element;
+use craft\feedme\Base\ElementInterface;
 use dolphiq\redirect\elements\Redirect as RedirectElement;
 
 class FeedMeRedirect extends Element implements ElementInterface
@@ -25,17 +23,17 @@ class FeedMeRedirect extends Element implements ElementInterface
     // Templates
     // =========================================================================
 
-    public function getGroupsTemplate()
+    public function getGroupsTemplate(): string
     {
         return 'redirect/_feed-me/groups';
     }
 
-    public function getColumnTemplate()
+    public function getColumnTemplate(): string
     {
         return 'redirect/_feed-me/column';
     }
 
-    public function getMappingTemplate()
+    public function getMappingTemplate(): string
     {
         return 'redirect/_feed-me/map';
     }
@@ -44,12 +42,12 @@ public function getMappingTemplate()
     // Public Methods
     // =========================================================================
 
-    public function getGroups()
+    public function getGroups(): array
     {
         return [];
     }
 
-    public function getQuery($settings, $params = [])
+    public function getQuery($settings, $params = []): mixed
     {
         $query = RedirectElement::find();
 
@@ -70,7 +68,7 @@ public function getQuery($settings, $params = [])
         return $query;
     }
 
-    public function setModel($settings)
+    public function setModel($settings): Redirect
     {
         $this->element = new RedirectElement();
 
@@ -83,7 +81,7 @@ public function setModel($settings)
         return $this->element;
     }
 
-    public function save($element, $settings)
+    public function save($element, $settings): bool
     {
         $this->element = $element;
 
diff --git a/src/elements/Redirect.php b/src/elements/Redirect.php
index 522274c..5b6099f 100644
--- a/src/elements/Redirect.php
+++ b/src/elements/Redirect.php
@@ -35,7 +35,7 @@ public static function displayName(): string
     /**
      * @inheritdoc
      */
-    public static function refHandle()
+    public static function refHandle(): ?string
     {
         return 'redirect';
     }
@@ -105,7 +105,7 @@ public function getSupportedSites(): array
     /**
      * @inheritdoc
      */
-    public function getCpEditUrl()
+    public function getCpEditUrl(): ?string
     {
         return UrlHelper::cpUrl('redirect/' . $this->id . '?siteId=' . $this->siteId);
 
@@ -167,12 +167,14 @@ protected static function defineSources(string $context = null): array
                     'label' => Craft::t('redirect', 'Temporarily redirects'),
                     'criteria' => ['statusCode' => 302]
                 ],
-                [
+                /*
+                 * @todo: add a toggle to set a redirect inactive
+                 * [
                     'key' => 'inactive',
                     'label' => Craft::t('redirect', 'Inactive redirects'),
                     'criteria' => ['hitAt' => 60]
 
-                ],
+                ],*/
             ];
         }
         return $sources;
@@ -270,7 +272,7 @@ protected static function defineActions(string $source = null): array
     /**
      * @inheritdoc
      */
-    public function rules()
+    public function rules(): array
     {
         $rules = parent::rules();
         $rules[] = [['hitAt'], DateTimeValidator::class];
@@ -313,7 +315,7 @@ public function beforeSave(bool $isNew): bool
      * @inheritdoc
      * @throws Exception if reasons
      */
-    public function afterSave(bool $isNew)
+    public function afterSave(bool $isNew): void
     {
         // Get the redirect record
         if (!$isNew) {
@@ -367,7 +369,7 @@ protected static function defineDefaultTableAttributes(string $source): array
     /**
      * @inheritdoc
      */
-    public function init()
+    public function init(): void
     {
         parent::init();
     }
@@ -378,7 +380,7 @@ public function init()
      * @return string
      */
     /** @noinspection PhpInconsistentReturnPointsInspection */
-    public function __toString()
+    public function __toString(): string
     {
         try {
             return $this->getName();
@@ -430,5 +432,5 @@ public function datetimeAttributes(): array
      * @var int|null siteId
      */
 
-    public $siteId;
+    public ?int $siteId;
 }
diff --git a/src/elements/actions/DeleteRedirects.php b/src/elements/actions/DeleteRedirects.php
index a509829..8ab34cf 100644
--- a/src/elements/actions/DeleteRedirects.php
+++ b/src/elements/actions/DeleteRedirects.php
@@ -35,7 +35,7 @@ public static function isDestructive(): bool
     /**
      * @inheritdoc
      */
-    public function getConfirmationMessage()
+    public function getConfirmationMessage(): ?string
     {
         return Craft::t('redirect', 'Are you sure you want to delete the selected redirects?');
     }
diff --git a/src/fields/Redirects.php b/src/fields/Redirects.php
index 8a7c47b..13849d1 100644
--- a/src/fields/Redirects.php
+++ b/src/fields/Redirects.php
@@ -9,14 +9,9 @@
 namespace dolphiq\redirect\fields;
 
 use Craft;
+use craft\fields\BaseRelationField;
 use dolphiq\redirect\elements\Redirect;
 
-/**
- * Users represents a Users field.
- *
- * @author Pixel & Tonic, Inc. <support@pixelandtonic.com>
- * @since  3.0
- */
 class Redirects extends BaseRelationField
 {
     // Static
@@ -33,7 +28,7 @@ public static function displayName(): string
     /**
      * @inheritdoc
      */
-    protected static function elementType(): string
+    public static function elementType():string
     {
         return Redirect::class;
     }
@@ -55,7 +50,7 @@ public static function defaultSelectionLabel(): string
     /**
      * @inheritdoc
      */
-    public function init()
+    public function init(): void
     {
         parent::init();
         $this->allowMultipleSources = false;
diff --git a/src/models/Settings.php b/src/models/Settings.php
index a28cd69..269ca4a 100644
--- a/src/models/Settings.php
+++ b/src/models/Settings.php
@@ -23,7 +23,7 @@ class Settings extends Model
     /**
      * @inheritdoc
      */
-    public function init()
+    public function init(): void
     {
         parent::init();
     }
@@ -31,7 +31,7 @@ public function init()
     /**
      * @inheritdoc
      */
-    public function rules()
+    public function rules(): array
     {
         return [
             [['redirectsActive', 'catchAllActive'], 'required'],
diff --git a/src/records/RedirectGroup.php b/src/records/RedirectGroup.php
index ba1e52b..7d6715f 100644
--- a/src/records/RedirectGroup.php
+++ b/src/records/RedirectGroup.php
@@ -5,9 +5,10 @@
  * @license   https://craftcms.com/license
  */
 
-namespace craft\records;
+namespace dolphiq\redirect\records;
 
 use craft\db\ActiveRecord;
+use craft\records\FieldLayout;
 use yii\db\ActiveQueryInterface;
 
 /**
diff --git a/src/templates/redirects.twig b/src/templates/redirects.twig
index ad9c118..e23fc85 100644
--- a/src/templates/redirects.twig
+++ b/src/templates/redirects.twig
@@ -17,7 +17,7 @@
     {% exit 404 %}
 {% endif %}
 
-{% set sources = craft.app.elementIndexes.getSources(elementType, 'index') %}
+{% set sources = craft.app.ElementSources.getSources(elementType, 'index') %}
 
 {% set showSiteMenu = (craft.app.getIsMultiSite() ? (showSiteMenu ?? 'auto') : false) %}
 {% if showSiteMenu == 'auto' %}