diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 5163d90..50c9b21 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -14,37 +14,14 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
-        php: [7.4, 8.0, 8.1, '8.2']
-        laravel: ['7.*', '8.*', '9.*', '10.*', '11.*']
+        php: [8.3, 8.2]
+        laravel: ['11.*', '10.*']
         stability: [prefer-lowest, prefer-stable]
         include:
           - laravel: 10.*
             testbench: 8.*
-          - laravel: 9.*
-            testbench: 7.*
-          - laravel: 8.*
-            testbench: ^6.24.1
-          - laravel: 7.*
-            testbench: ^5.20.0
           - laravel: 11.*
             testbench: 9.*
-        exclude:
-          - laravel: 10.*
-            php: 8.0
-          - laravel: 10.*
-            php: 7.4
-          - laravel: 9.*
-            php: 7.4
-          - laravel: 7.*
-            php: 8.0
-          - laravel: 7.*
-            php: 8.1
-          - laravel: 11.*
-            php: 7.4
-          - laravel: 11.*
-            php: 8.0
-          - laravel: 11.*
-            php: 8.1
 
     name: P${{ matrix.php }} - L${{ matrix.laravel }} - ${{ matrix.stability }} - ${{ matrix.os }}
 
diff --git a/composer.json b/composer.json
index f3adeda..382ba6b 100755
--- a/composer.json
+++ b/composer.json
@@ -17,16 +17,16 @@
         }
     ],
     "require": {
-        "php": "^8.0|^7.4",
-        "illuminate/contracts": "9.*|8.*|7.*|^10.0|^11.0"
+        "php": "^8.2",
+        "illuminate/contracts": "^10.0|^11.0"
     },
     "require-dev": {
-        "orchestra/testbench": "^7.0|^6.24.1|^v5.20.0|^8.0|^9.0",
-        "phpunit/phpunit": "^9.5.13|^8.3|^9.5.10|^10.5",
-        "nunomaduro/collision": "^6.0|^5.0|^8.0",
-        "nunomaduro/larastan": "^2.0|^1.0",
+        "orchestra/testbench": "^8.0|^9.0",
+        "phpunit/phpunit": "^9.5.10|^10.5",
+        "nunomaduro/collision": "^6.0|^8.0",
+        "larastan/larastan": "^2.0",
         "pestphp/pest": "^1.21|^2.34",
-        "pestphp/pest-plugin-laravel": "^1.1|^2.3",
+        "pestphp/pest-plugin-laravel": "^2.3",
         "phpstan/extension-installer": "^1.1",
         "phpstan/phpstan-deprecation-rules": "^1.0",
         "phpstan/phpstan-phpunit": "^1.0",
diff --git a/src/Channels/SubscriberMailChannel.php b/src/Channels/SubscriberMailChannel.php
index 37aa688..3f4982e 100644
--- a/src/Channels/SubscriberMailChannel.php
+++ b/src/Channels/SubscriberMailChannel.php
@@ -25,8 +25,7 @@ class SubscriberMailChannel extends MailChannel
      *
      * @param mixed $notifiable
      * @param \Illuminate\Notifications\Notification $notification
-     *
-     * @return void
+     * @return \Illuminate\Mail\SentMessage|null
      */
     public function send($notifiable, Notification $notification)
     {
@@ -35,7 +34,7 @@ public function send($notifiable, Notification $notification)
             $notification instanceof CheckNotifiableSubscriptionStatus &&
             $notification->checkMailSubscriptionStatus() &&
             ! $notifiable->mailSubscriptionStatus($notification)) {
-            return;
+            return null;
         }
 
         if (method_exists($notification, 'toMail')) {
@@ -56,16 +55,16 @@ public function send($notifiable, Notification $notification)
 
         if (! $notifiable->routeNotificationFor('mail', $notification) &&
             ! $message instanceof Mailable) {
-            return;
+            return null;
         }
 
         if ($message instanceof Mailable) {
             $message->send($this->mailer);
 
-            return;
+            return null;
         }
 
-        $this->mailer->mailer($message->mailer ?? null)->send(
+        return $this->mailer->mailer($message->mailer ?? null)->send(
             $this->buildView($message),
             array_merge($message->data(), $this->additionalMessageData($notification)),
             $this->messageBuilder($notifiable, $notification, $message)
diff --git a/src/Facades/Subscriber.php b/src/Facades/Subscriber.php
index 8b07a99..93776a8 100644
--- a/src/Facades/Subscriber.php
+++ b/src/Facades/Subscriber.php
@@ -12,7 +12,7 @@
  *
  * @method static void routes()
  * @method static string routeName()
- * @method static userModel(string $model = null)
+ * @method static mixed userModel(string $model = null)
  * @method static void onCompletion(callable|string $handler)
  * @method static void onUnsubscribeFromMailingList(callable|string $handler)
  * @method static void onUnsubscribeFromAllMailingLists(callable|string $handler)
diff --git a/src/SubscribableApplicationServiceProvider.php b/src/SubscribableApplicationServiceProvider.php
index 7091a4c..86fdac0 100644
--- a/src/SubscribableApplicationServiceProvider.php
+++ b/src/SubscribableApplicationServiceProvider.php
@@ -22,7 +22,9 @@ public function boot()
             $this->loadRoutes();
         }
 
-        \YlsIdeas\SubscribableNotifications\Facades\Subscriber::userModel($this->userModel());
+        \YlsIdeas\SubscribableNotifications\Facades\Subscriber::userModel(
+            $this->userModel()
+        );
 
         \YlsIdeas\SubscribableNotifications\Facades\Subscriber::onUnsubscribeFromMailingList(
             $this->onUnsubscribeFromMailingList()
diff --git a/src/Subscriber.php b/src/Subscriber.php
index 11b2a6b..9d73b40 100644
--- a/src/Subscriber.php
+++ b/src/Subscriber.php
@@ -176,22 +176,15 @@ public function checkSubscriptionStatus($user, ?string $mailingList = null)
         return (bool) call_user_func($this->onCheckSubscriptionStatusForAllMailingLists, $user);
     }
 
-    /**
-     * @param string|callable $handler
-     * @return callable
-     * @throws \Illuminate\Contracts\Container\BindingResolutionException
-     */
-    protected function parseHandler($handler)
+    protected function parseHandler(string|callable$handler): callable
     {
         if (is_string($handler)) {
             $parsed = Str::parseCallback($handler);
             $parsed[0] = $this->app->make($parsed[0]);
 
             return $parsed;
-        } elseif (is_callable($handler)) {
-            return $handler;
         }
 
-        throw new InvalidArgumentException('Handler argument must be either a string or callable.');
+        return $handler;
     }
 }
diff --git a/tests/SubscriberTest.php b/tests/SubscriberTest.php
index 328cb12..675e37a 100755
--- a/tests/SubscriberTest.php
+++ b/tests/SubscriberTest.php
@@ -291,19 +291,6 @@ public function it_handles_checking_subscription_status_of_all_mailing_lists_via
         $this->assertTrue($subscriber->checkSubscriptionStatus($expectedUser));
     }
 
-    /** @test */
-    public function it_handles_type_checks_for_a_callable_or_string_handler()
-    {
-        $this->expectException(\InvalidArgumentException::class);
-        $this->expectExceptionMessage('Handler argument must be either a string or callable.');
-
-        $subscriber = new Subscriber($this->app);
-
-        $subscriber->onCompletion(
-            new \stdClass()
-        );
-    }
-
     /** @test */
     public function it_can_provide_a_user_model()
     {