diff --git a/app/Controllers/EpisodeAudioController.php b/app/Controllers/EpisodeAudioController.php
index fadb311f..4c94cf80 100644
--- a/app/Controllers/EpisodeAudioController.php
+++ b/app/Controllers/EpisodeAudioController.php
@@ -101,9 +101,9 @@ class EpisodeAudioController extends Controller
         $subscription = null;
 
         // check if podcast is already unlocked before any token validation
-        if ($this->episode->is_premium && ($subscription = service('premium_podcasts')->subscription(
+        if ($this->episode->is_premium && ! ($subscription = service('premium_podcasts')->subscription(
             $this->episode->podcast->handle
-        )) === null) {
+        )) instanceof Subscription) {
             // look for token as GET parameter
             if (($token = $this->request->getGet('token')) === null) {
                 return $this->response->setStatusCode(401)
@@ -164,7 +164,7 @@ class EpisodeAudioController extends Controller
             $audioDuration,
             $this->episode->published_at->getTimestamp(),
             $serviceName,
-            $subscription !== null ? $subscription->id : null
+            $subscription instanceof Subscription ? $subscription->id : null
         );
 
         return redirect()->to($this->analyticsConfig->getAudioUrl($this->episode, $this->request->getGet()));
diff --git a/app/Controllers/EpisodeController.php b/app/Controllers/EpisodeController.php
index 7ca30bb1..00d87eeb 100644
--- a/app/Controllers/EpisodeController.php
+++ b/app/Controllers/EpisodeController.php
@@ -177,8 +177,8 @@ class EpisodeController extends BaseController
 
         $session = Services::session();
         $session->start();
-        if (isset($_SERVER['HTTP_REFERER'])) {
-            $session->set('embed_domain', parse_url((string) $_SERVER['HTTP_REFERER'], PHP_URL_HOST));
+        if (service('superglobals')->server('HTTP_REFERER') !== null) {
+            $session->set('embed_domain', parse_url(service('superglobals')->server('HTTP_REFERER'), PHP_URL_HOST));
         }
 
         $cacheName = implode(
diff --git a/app/Controllers/FeedController.php b/app/Controllers/FeedController.php
index fbf742f9..a99cfcda 100644
--- a/app/Controllers/FeedController.php
+++ b/app/Controllers/FeedController.php
@@ -43,7 +43,7 @@ class FeedController extends Controller
 
         $service = null;
         try {
-            $service = UserAgentsRSS::find($_SERVER['HTTP_USER_AGENT']);
+            $service = UserAgentsRSS::find(service('superglobals')->server('HTTP_USER_AGENT'));
         } catch (Exception $exception) {
             // If things go wrong the show must go on and the user must be able to download the file
             log_message('critical', $exception->getMessage());
diff --git a/app/Helpers/url_helper.php b/app/Helpers/url_helper.php
index b5e53c17..656c8459 100644
--- a/app/Helpers/url_helper.php
+++ b/app/Helpers/url_helper.php
@@ -16,13 +16,14 @@ if (! function_exists('host_url')) {
      */
     function host_url(): ?string
     {
-        if (isset($_SERVER['HTTP_HOST'])) {
+        $superglobals = service('superglobals');
+        if ($superglobals->server('HTTP_HOST') !== null) {
             $protocol =
-                (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ||
-                $_SERVER['SERVER_PORT'] === 443
+                ($superglobals->server('HTTPS') !== null && $superglobals->server('HTTPS') !== 'off') ||
+                (int) $superglobals->server('SERVER_PORT') === 443
                     ? 'https://'
                     : 'http://';
-            return $protocol . $_SERVER['HTTP_HOST'] . '/';
+            return $protocol . $superglobals->server('HTTP_HOST') . '/';
         }
 
         return null;
diff --git a/composer.json b/composer.json
index 644be9a3..88e8a0d2 100644
--- a/composer.json
+++ b/composer.json
@@ -29,13 +29,15 @@
     "yassinedoghri/podcast-feed": "dev-main"
   },
   "require-dev": {
-    "mikey179/vfsstream": "^v1.6.11",
-    "phpunit/phpunit": "^10.3.2",
     "captainhook/captainhook": "^5.16.4",
-    "symplify/easy-coding-standard": "^12.0.7",
+    "codeigniter/phpstan-codeigniter": "^1.0",
+    "mikey179/vfsstream": "^v1.6.11",
+    "phpstan/extension-installer": "^1.3",
     "phpstan/phpstan": "^1.10.32",
+    "phpunit/phpunit": "^10.3.2",
     "rector/rector": "^0.18.0",
-    "symplify/coding-standard": "^12.0.3"
+    "symplify/coding-standard": "^12.0.3",
+    "symplify/easy-coding-standard": "^12.0.7"
   },
   "autoload": {
     "exclude-from-classmap": [
diff --git a/composer.lock b/composer.lock
index 970c6488..e4fc770f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
     "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
     "This file is @generated automatically"
   ],
-  "content-hash": "4526c68d78e5abe8e5c86016356e15f9",
+  "content-hash": "02db4cf9b79f67dad431f7d10f5c19f4",
   "packages": [
     {
       "name": "adaures/ipcat-php",
@@ -3224,6 +3224,73 @@
       ],
       "time": "2023-04-17T19:48:47+00:00"
     },
+    {
+      "name": "codeigniter/phpstan-codeigniter",
+      "version": "v1.0.0",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/CodeIgniter/phpstan-codeigniter.git",
+        "reference": "2c6eebd9798e463ea8596493bd068310b7a701d9"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/CodeIgniter/phpstan-codeigniter/zipball/2c6eebd9798e463ea8596493bd068310b7a701d9",
+        "reference": "2c6eebd9798e463ea8596493bd068310b7a701d9",
+        "shasum": ""
+      },
+      "require": {
+        "php": "^8.1",
+        "phpstan/phpstan": "^1.10"
+      },
+      "conflict": {
+        "codeigniter/framework": "*"
+      },
+      "require-dev": {
+        "codeigniter/coding-standard": "^1.7",
+        "codeigniter4/framework": "^4.3",
+        "friendsofphp/php-cs-fixer": "^3.20",
+        "nexusphp/cs-config": "^3.12",
+        "phpstan/extension-installer": "^1.3",
+        "phpstan/phpstan-deprecation-rules": "^1.1",
+        "phpstan/phpstan-phpunit": "^1.3",
+        "phpstan/phpstan-strict-rules": "^1.5",
+        "phpunit/phpunit": "^10.2"
+      },
+      "type": "phpstan-extension",
+      "extra": {
+        "phpstan": {
+          "includes": ["extension.neon"]
+        }
+      },
+      "autoload": {
+        "psr-4": {
+          "CodeIgniter\\PHPStan\\": "src/"
+        }
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": ["MIT"],
+      "authors": [
+        {
+          "name": "John Paul E. Balandan, CPA",
+          "email": "paulbalandan@gmail.com"
+        }
+      ],
+      "description": "CodeIgniter extensions and rules for PHPStan",
+      "keywords": [
+        "PHPStan",
+        "codeigniter",
+        "codeigniter4",
+        "dev",
+        "static analysis"
+      ],
+      "support": {
+        "forum": "http://forum.codeigniter.com/",
+        "issues": "https://github.com/CodeIgniter/phpstan-codeigniter/issues",
+        "slack": "https://codeigniterchat.slack.com",
+        "source": "https://github.com/CodeIgniter/phpstan-codeigniter"
+      },
+      "time": "2023-08-27T09:19:23+00:00"
+    },
     {
       "name": "composer/pcre",
       "version": "3.1.0",
@@ -3905,6 +3972,48 @@
       },
       "time": "2022-02-21T01:04:05+00:00"
     },
+    {
+      "name": "phpstan/extension-installer",
+      "version": "1.3.1",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/phpstan/extension-installer.git",
+        "reference": "f45734bfb9984c6c56c4486b71230355f066a58a"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/phpstan/extension-installer/zipball/f45734bfb9984c6c56c4486b71230355f066a58a",
+        "reference": "f45734bfb9984c6c56c4486b71230355f066a58a",
+        "shasum": ""
+      },
+      "require": {
+        "composer-plugin-api": "^2.0",
+        "php": "^7.2 || ^8.0",
+        "phpstan/phpstan": "^1.9.0"
+      },
+      "require-dev": {
+        "composer/composer": "^2.0",
+        "php-parallel-lint/php-parallel-lint": "^1.2.0",
+        "phpstan/phpstan-strict-rules": "^0.11 || ^0.12 || ^1.0"
+      },
+      "type": "composer-plugin",
+      "extra": {
+        "class": "PHPStan\\ExtensionInstaller\\Plugin"
+      },
+      "autoload": {
+        "psr-4": {
+          "PHPStan\\ExtensionInstaller\\": "src/"
+        }
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": ["MIT"],
+      "description": "Composer plugin for automatic installation of PHPStan extensions",
+      "support": {
+        "issues": "https://github.com/phpstan/extension-installer/issues",
+        "source": "https://github.com/phpstan/extension-installer/tree/1.3.1"
+      },
+      "time": "2023-05-24T08:59:17+00:00"
+    },
     {
       "name": "phpstan/phpstan",
       "version": "1.10.32",
diff --git a/modules/Fediverse/Controllers/ActorController.php b/modules/Fediverse/Controllers/ActorController.php
index 8e725dee..589a3ff8 100644
--- a/modules/Fediverse/Controllers/ActorController.php
+++ b/modules/Fediverse/Controllers/ActorController.php
@@ -17,6 +17,7 @@ use CodeIgniter\HTTP\ResponseInterface;
 use CodeIgniter\I18n\Time;
 use Exception;
 use Modules\Fediverse\Config\Fediverse;
+use Modules\Fediverse\Entities\Activity;
 use Modules\Fediverse\Entities\Actor;
 use Modules\Fediverse\Entities\Post;
 use Modules\Fediverse\Objects\OrderedCollectionObject;
@@ -45,7 +46,7 @@ class ActorController extends Controller
         }
 
         if (
-            ($actor = model('ActorModel', false)->getActorByUsername($params[0])) === null
+            ! ($actor = model('ActorModel', false)->getActorByUsername($params[0])) instanceof Actor
         ) {
             throw PageNotFoundException::forPageNotFound();
         }
@@ -101,7 +102,7 @@ class ActorController extends Controller
                         ->getPostByUri($payload->object->inReplyTo);
 
                     $reply = null;
-                    if ($replyToPost !== null) {
+                    if ($replyToPost instanceof Post) {
                         // TODO: strip content from html to retrieve message
                         // remove all html tags and reconstruct message with mentions?
                         $message = get_message_from_object($payload->object);
@@ -136,7 +137,7 @@ class ActorController extends Controller
                 $postToDelete = model('PostModel', false)
                     ->getPostByUri($payload->object->id);
 
-                if ($postToDelete !== null) {
+                if ($postToDelete instanceof Post) {
                     model('PostModel', false)
                         ->removePost($postToDelete, false);
                 }
@@ -160,7 +161,7 @@ class ActorController extends Controller
                 $post = model('PostModel', false)
                     ->getPostByUri($payload->object);
 
-                if ($post !== null) {
+                if ($post instanceof Post) {
                     // Like side-effect
                     model('FavouriteModel', false)
                         ->addFavourite($payloadActor, $post, false);
@@ -177,7 +178,7 @@ class ActorController extends Controller
                 $post = model('PostModel', false)
                     ->getPostByUri($payload->object);
 
-                if ($post !== null) {
+                if ($post instanceof Post) {
                     model('ActivityModel', false)
                         ->update($activityId, [
                             'post_id' => $post->id,
@@ -205,7 +206,7 @@ class ActorController extends Controller
                         $post = model('PostModel', false)
                             ->getPostByUri($payload->object->object);
 
-                        if ($post !== null) {
+                        if ($post instanceof Post) {
                             // revert side-effect by removing favourite from database
                             model('FavouriteModel', false)
                                 ->removeFavourite($payloadActor, $post, false);
@@ -223,7 +224,7 @@ class ActorController extends Controller
                             ->getPostByUri($payload->object->object);
 
                         $reblogPost = null;
-                        if ($post !== null) {
+                        if ($post instanceof Post) {
                             $reblogPost = model('PostModel', false)
                                 ->where([
                                     'actor_id'     => $payloadActor->id,
@@ -374,7 +375,7 @@ class ActorController extends Controller
     public function activity(string $activityId): ResponseInterface
     {
         if (
-            ! ($activity = model('ActivityModel', false)->getActivityById($activityId))
+            ! ($activity = model('ActivityModel', false)->getActivityById($activityId)) instanceof Activity
         ) {
             throw PageNotFoundException::forPageNotFound();
         }
diff --git a/modules/Fediverse/Controllers/PostController.php b/modules/Fediverse/Controllers/PostController.php
index 267e818e..8837521c 100644
--- a/modules/Fediverse/Controllers/PostController.php
+++ b/modules/Fediverse/Controllers/PostController.php
@@ -50,7 +50,7 @@ class PostController extends Controller
 
     public function _remap(string $method, string ...$params): mixed
     {
-        if (($post = model('PostModel', false)->getPostById($params[0])) === null) {
+        if (! ($post = model('PostModel', false)->getPostById($params[0])) instanceof Post) {
             throw PageNotFoundException::forPageNotFound();
         }
 
diff --git a/modules/Fediverse/Entities/Actor.php b/modules/Fediverse/Entities/Actor.php
index 97948796..1a7a3f6c 100644
--- a/modules/Fediverse/Entities/Actor.php
+++ b/modules/Fediverse/Entities/Actor.php
@@ -102,7 +102,7 @@ class Actor extends Entity
         }
 
         if ($this->followers === null) {
-            $this->followers = (array) model('ActorModel', false)
+            $this->followers = model('ActorModel', false)
                 ->getFollowers($this->id);
         }
 
diff --git a/modules/Fediverse/Entities/Post.php b/modules/Fediverse/Entities/Post.php
index 45f43bee..f0990601 100644
--- a/modules/Fediverse/Entities/Post.php
+++ b/modules/Fediverse/Entities/Post.php
@@ -126,7 +126,7 @@ class Post extends UuidEntity
         }
 
         if ($this->replies === null) {
-            $this->replies = (array) model('PostModel', false)
+            $this->replies = model('PostModel', false)
                 ->getPostReplies($this->id);
         }
 
@@ -162,7 +162,7 @@ class Post extends UuidEntity
         }
 
         if ($this->reblogs === null) {
-            $this->reblogs = (array) model('PostModel', false)
+            $this->reblogs = model('PostModel', false)
                 ->getPostReblogs($this->id);
         }
 
diff --git a/modules/Fediverse/Helpers/fediverse_helper.php b/modules/Fediverse/Helpers/fediverse_helper.php
index 53f662f2..5a6a3004 100644
--- a/modules/Fediverse/Helpers/fediverse_helper.php
+++ b/modules/Fediverse/Helpers/fediverse_helper.php
@@ -212,8 +212,8 @@ if (! function_exists('get_or_create_preview_card_from_url')) {
     {
         // check if preview card has already been generated
         if (
-            $previewCard = model('PreviewCardModel', false)
-                ->getPreviewCardFromUrl((string) $url)
+            ($previewCard = model('PreviewCardModel', false)
+                ->getPreviewCardFromUrl((string) $url)) instanceof PreviewCard
         ) {
             return $previewCard;
         }
@@ -231,7 +231,7 @@ if (! function_exists('get_or_create_actor_from_uri')) {
     function get_or_create_actor_from_uri(string $actorUri): ?Actor
     {
         // check if actor exists in database already and return it
-        if ($actor = model('ActorModel', false)->getActorByUri($actorUri)) {
+        if (($actor = model('ActorModel', false)->getActorByUri($actorUri)) instanceof Actor) {
             return $actor;
         }
 
@@ -249,8 +249,8 @@ if (! function_exists('get_or_create_actor')) {
     {
         // check if actor exists in database already and return it
         if (
-            $actor = model('ActorModel', false)
-                ->getActorByUsername($username, $domain)
+            ($actor = model('ActorModel', false)
+                ->getActorByUsername($username, $domain)) instanceof Actor
         ) {
             return $actor;
         }
@@ -412,9 +412,9 @@ if (! function_exists('linkify')) {
                         // check if host is set and look for actor in database
                         if (isset($match['host'])) {
                             if (
-                                $actor = model(
+                                ($actor = model(
                                     'ActorModel',
-                                )->getActorByUsername($match['username'], $match['domain'])
+                                )->getActorByUsername($match['username'], $match['domain'])) instanceof Actor
                             ) {
                                 // TODO: check that host is local to remove target blank?
                                 return '<' .
@@ -447,8 +447,8 @@ if (! function_exists('linkify')) {
                             }
                         } else {
                             if (
-                                $actor = model('ActorModel', false)
-                                    ->getActorByUsername($match['username'])
+                                ($actor = model('ActorModel', false)
+                                    ->getActorByUsername($match['username'])) instanceof Actor
                             ) {
                                 return '<' .
                                     array_push($links, anchor($actor->uri, $match[0])) .
diff --git a/modules/Fediverse/WebFinger.php b/modules/Fediverse/WebFinger.php
index fd731ad8..788e0fdf 100644
--- a/modules/Fediverse/WebFinger.php
+++ b/modules/Fediverse/WebFinger.php
@@ -11,6 +11,7 @@ declare(strict_types=1);
 namespace Modules\Fediverse;
 
 use Exception;
+use Modules\Fediverse\Entities\Actor;
 
 class WebFinger
 {
@@ -62,7 +63,7 @@ class WebFinger
         }
 
         if (
-            ! ($actor = model('ActorModel', false)->getActorByUsername($username, $domain))
+            ! ($actor = model('ActorModel', false)->getActorByUsername($username, $domain)) instanceof Actor
         ) {
             throw new Exception('Could not find actor');
         }
diff --git a/modules/PremiumPodcasts/Config/Services.php b/modules/PremiumPodcasts/Config/Services.php
index c8fb03b4..54250431 100644
--- a/modules/PremiumPodcasts/Config/Services.php
+++ b/modules/PremiumPodcasts/Config/Services.php
@@ -4,14 +4,16 @@ declare(strict_types=1);
 
 namespace Modules\PremiumPodcasts\Config;
 
-use Config\Services as BaseService;
+use CodeIgniter\Config\BaseService;
 use Modules\PremiumPodcasts\Models\SubscriptionModel;
 use Modules\PremiumPodcasts\PremiumPodcasts;
 
 class Services extends BaseService
 {
-    public static function premium_podcasts(?SubscriptionModel $subscriptionModel = null, bool $getShared = true)
-    {
+    public static function premium_podcasts(
+        ?SubscriptionModel $subscriptionModel = null,
+        bool $getShared = true
+    ): PremiumPodcasts {
         if ($getShared) {
             return self::getSharedInstance('premium_podcasts', $subscriptionModel);
         }
diff --git a/phpstan.neon b/phpstan.neon
index b5a2a9f5..183ded38 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -16,11 +16,34 @@ parameters:
         - app/Views/*
         - modules/*/Views/*
         - themes/*
+    codeigniter:
+        additionalConfigNamespaces:
+            - Modules\Admin\Config\
+            - Modules\Analytics\Config\
+            - Modules\Api\Rest\V1\Config\
+            - Modules\Auth\Config\
+            - Modules\Fediverse\Config\
+            - Modules\Install\Config\
+            - Modules\Media\Config\
+            - Modules\MediaClipper\Config\
+            - Modules\PodcastImport\Config\
+            - Modules\PremiumPodcasts\Config\
+            - Modules\WebSub\Config\
+        additionalModelNamespaces:
+            - Modules\Analytics\Models\
+            - Modules\Auth\Models\
+            - Modules\Fediverse\Models\
+            - Modules\Media\Models\
+            - Modules\PremiumPodcasts\Models\
+        additionalServices:
+            - CodeIgniter\Settings\Config\Services
+            - Michalsn\Uuid\Config\Services
+            - Modules\PremiumPodcasts\Config\Services
+            - Modules\Media\Config\Services
     dynamicConstantNames:
         - APP_NAMESPACE
         - CI_DEBUG
         - ENVIRONMENT
         - SODIUM_LIBRARY_VERSION
     ignoreErrors:
-        - '#^Access to an undefined property Modules\\Media\\Entities\\Image#'
         - '#^Call to an undefined method CodeIgniter\\Cache\\CacheInterface\:\:deleteMatching\(\)#'
diff --git a/rector.php b/rector.php
index 782fdda8..ef860a13 100644
--- a/rector.php
+++ b/rector.php
@@ -71,4 +71,5 @@ return static function (RectorConfig $rectorConfig): void {
 
     // Path to phpstan with extensions, that PHPStan in Rector uses to determine types
     $rectorConfig->phpstanConfig(__DIR__ . '/phpstan.neon');
+    $rectorConfig->phpstanConfigs(['vendor/codeigniter/phpstan-codeigniter/extension.neon']);
 };