diff --git a/composer.json b/composer.json
index 1e21970..5dc3c83 100644
--- a/composer.json
+++ b/composer.json
@@ -14,8 +14,8 @@
     "require": {
         "php": ">=7.1.3",
         "guzzlehttp/guzzle": "^6.2 || ^7.0",
-        "illuminate/notifications": "~5.6 || ~6.0 || ~7.0 || ~8.0",
-        "illuminate/support": "~5.6 || ~6.0 || ~7.0 || ~8.0",
+        "illuminate/notifications": "~5.6 || ~6.0 || ~7.0 || ~8.0 || ~9.0",
+        "illuminate/support": "~5.6 || ~6.0 || ~7.0 || ~8.0 || ~9.0",
         "kreait/laravel-firebase": "^1.3 || ^2.1 || ^3.0",
         "spatie/enum": "^2.3 || ^3.0"
     },
diff --git a/src/FcmMessage.php b/src/FcmMessage.php
index 12d328b..ee2c7c8 100644
--- a/src/FcmMessage.php
+++ b/src/FcmMessage.php
@@ -75,7 +75,7 @@ public function getName(): ?string
     }
 
     /**
-     * @param string|null $name
+     * @param  string|null  $name
      * @return FcmMessage
      */
     public function setName(?string $name): self
@@ -94,7 +94,7 @@ public function getData(): ?array
     }
 
     /**
-     * @param array|null $data
+     * @param  array|null  $data
      * @return FcmMessage
      */
     public function setData(?array $data): self
@@ -113,7 +113,7 @@ public function getNotification(): ?Notification
     }
 
     /**
-     * @param Notification|null $notification
+     * @param  Notification|null  $notification
      * @return FcmMessage
      */
     public function setNotification(?Notification $notification): self
@@ -132,7 +132,7 @@ public function getAndroid(): ?AndroidConfig
     }
 
     /**
-     * @param AndroidConfig|null $android
+     * @param  AndroidConfig|null  $android
      * @return FcmMessage
      */
     public function setAndroid(?AndroidConfig $android): self
@@ -151,7 +151,7 @@ public function getWebpush(): ?WebpushConfig
     }
 
     /**
-     * @param WebpushConfig|null $webpush
+     * @param  WebpushConfig|null  $webpush
      * @return FcmMessage
      */
     public function setWebpush(?WebpushConfig $webpush): self
@@ -170,7 +170,7 @@ public function getApns(): ?ApnsConfig
     }
 
     /**
-     * @param ApnsConfig|null $apns
+     * @param  ApnsConfig|null  $apns
      * @return FcmMessage
      */
     public function setApns(?ApnsConfig $apns): self
@@ -189,7 +189,7 @@ public function getFcmOptions(): ?FcmOptions
     }
 
     /**
-     * @param FcmOptions|null $fcmOptions
+     * @param  FcmOptions|null  $fcmOptions
      * @return FcmMessage
      */
     public function setFcmOptions(?FcmOptions $fcmOptions): self
@@ -208,7 +208,7 @@ public function getToken(): ?string
     }
 
     /**
-     * @param string|null $token
+     * @param  string|null  $token
      * @return FcmMessage
      */
     public function setToken(?string $token): self
@@ -227,7 +227,7 @@ public function getTopic(): ?string
     }
 
     /**
-     * @param string|null $topic
+     * @param  string|null  $topic
      * @return FcmMessage
      */
     public function setTopic(?string $topic): self
@@ -246,7 +246,7 @@ public function getCondition(): ?string
     }
 
     /**
-     * @param string|null $condition
+     * @param  string|null  $condition
      * @return FcmMessage
      */
     public function setCondition(?string $condition): self
@@ -272,7 +272,7 @@ public function toArray()
         ];
     }
 
-    public function jsonSerialize()
+    public function jsonSerialize(): mixed
     {
         return $this->toArray();
     }