diff --git a/composer.json b/composer.json
index f5f071b7..c3ddd5e2 100644
--- a/composer.json
+++ b/composer.json
@@ -42,7 +42,7 @@
     "orchestra/testbench": "*",
     "guzzlehttp/guzzle": "^7.3",
     "guzzlehttp/psr7": "^1.7 || ^2.0",
-    "phpstan/phpstan": "^1.10",
+    "phpstan/phpstan": "^2.0",
     "phpunit/phpunit": "^10.2"
   },
   "autoload": {
diff --git a/docs/classes/LINE-Laravel-Tests-Facades-FacadesTest.html b/docs/classes/LINE-Laravel-Tests-Facades-FacadesTest.html
index 608157d3..27954284 100644
--- a/docs/classes/LINE-Laravel-Tests-Facades-FacadesTest.html
+++ b/docs/classes/LINE-Laravel-Tests-Facades-FacadesTest.html
@@ -167,7 +167,7 @@ <h5 class="phpdocumentor-tag-list__heading" id="tags">
                 </dt>
                 <dd class="phpdocumentor-tag-list__definition">
                                                                                 
-                                                 <section class="phpdocumentor-description"><p>(PHPMD.CouplingBetweenObjects)</p>
+                                                 <section class="phpdocumentor-description"><p>(&quot;PHPMD.CouplingBetweenObjects&quot;)</p>
 </section>
 
                                     </dd>
@@ -294,7 +294,7 @@ <h5 class="phpdocumentor-tag-list__heading" id="tags">
                 </dt>
                 <dd class="phpdocumentor-tag-list__definition">
                                                                                 
-                                                 <section class="phpdocumentor-description"><p>(PHPMD.UnusedFormalParameter)</p>
+                                                 <section class="phpdocumentor-description"><p>(&quot;PHPMD.UnusedFormalParameter&quot;)</p>
 </section>
 
                                     </dd>
@@ -352,7 +352,7 @@ <h5 class="phpdocumentor-tag-list__heading" id="tags">
                 </dt>
                 <dd class="phpdocumentor-tag-list__definition">
                                                                                 
-                                                 <section class="phpdocumentor-description"><p>(PHPMD.UnusedFormalParameter)</p>
+                                                 <section class="phpdocumentor-description"><p>(&quot;PHPMD.UnusedFormalParameter&quot;)</p>
 </section>
 
                                     </dd>
@@ -410,7 +410,7 @@ <h5 class="phpdocumentor-tag-list__heading" id="tags">
                 </dt>
                 <dd class="phpdocumentor-tag-list__definition">
                                                                                 
-                                                 <section class="phpdocumentor-description"><p>(PHPMD.UnusedFormalParameter)</p>
+                                                 <section class="phpdocumentor-description"><p>(&quot;PHPMD.UnusedFormalParameter&quot;)</p>
 </section>
 
                                     </dd>
diff --git a/docs/classes/LINE-Parser-EventRequestParser.html b/docs/classes/LINE-Parser-EventRequestParser.html
index 4ab2d6fd..c1e1a3fa 100644
--- a/docs/classes/LINE-Parser-EventRequestParser.html
+++ b/docs/classes/LINE-Parser-EventRequestParser.html
@@ -162,7 +162,7 @@ <h5 class="phpdocumentor-tag-list__heading" id="tags">
                 </dt>
                 <dd class="phpdocumentor-tag-list__definition">
                                                                                 
-                                                 <section class="phpdocumentor-description"><p>(PHPMD.CouplingBetweenObjects)</p>
+                                                 <section class="phpdocumentor-description"><p>(&quot;PHPMD.CouplingBetweenObjects&quot;)</p>
 </section>
 
                                     </dd>
diff --git a/docs/classes/LINE-Parser-Tests-EventRequestParserTest.html b/docs/classes/LINE-Parser-Tests-EventRequestParserTest.html
index 83b6fe14..d24c9fab 100644
--- a/docs/classes/LINE-Parser-Tests-EventRequestParserTest.html
+++ b/docs/classes/LINE-Parser-Tests-EventRequestParserTest.html
@@ -1223,7 +1223,7 @@ <h4 class="phpdocumentor-element__name" id="method_getSignature">
     <aside class="phpdocumentor-element-found-in">
     <abbr class="phpdocumentor-element-found-in__file" title="src/parser/test/EventRequestParserTest.php"><a href="files/src-parser-test-eventrequestparsertest.html"><abbr title="src/parser/test/EventRequestParserTest.php">EventRequestParserTest.php</abbr></a></abbr>
     :
-    <span class="phpdocumentor-element-found-in__line">1715</span>
+    <span class="phpdocumentor-element-found-in__line">1714</span>
 
     </aside>
 
diff --git a/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/Flex/FlexSampleRestaurant.php b/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/Flex/FlexSampleRestaurant.php
index 7576c589..89dcf20d 100644
--- a/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/Flex/FlexSampleRestaurant.php
+++ b/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/Flex/FlexSampleRestaurant.php
@@ -49,7 +49,7 @@
 use LINE\Constants\MessageType;
 
 /**
- * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
+ * @SuppressWarnings("PHPMD.CouplingBetweenObjects")
  */
 class FlexSampleRestaurant
 {
diff --git a/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/Flex/FlexSampleShopping.php b/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/Flex/FlexSampleShopping.php
index e3b5c174..62994e2c 100644
--- a/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/Flex/FlexSampleShopping.php
+++ b/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/Flex/FlexSampleShopping.php
@@ -43,7 +43,7 @@
 use LINE\Constants\MessageType;
 
 /**
- * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
+ * @SuppressWarnings("PHPMD.CouplingBetweenObjects")
  */
 class FlexSampleShopping
 {
diff --git a/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/ImageMessageHandler.php b/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/ImageMessageHandler.php
index f3306ea2..33537a2a 100644
--- a/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/ImageMessageHandler.php
+++ b/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/ImageMessageHandler.php
@@ -30,7 +30,7 @@
 use LINE\Webhook\Model\MessageEvent;
 
 /**
- * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
+ * @SuppressWarnings("PHPMD.CouplingBetweenObjects")
  */
 class ImageMessageHandler implements EventHandler
 {
diff --git a/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/TextMessageHandler.php b/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/TextMessageHandler.php
index ad7b666b..4c68291e 100644
--- a/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/TextMessageHandler.php
+++ b/examples/KitchenSink/src/LINEBot/KitchenSink/EventHandler/MessageHandler/TextMessageHandler.php
@@ -57,9 +57,9 @@
 use LINE\Webhook\Model\TextMessageContent;
 
 /**
- * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
- * @SuppressWarnings(PHPMD.CyclomaticComplexity)
- * @SuppressWarnings(PHPMD.ExcessiveMethodLength)
+ * @SuppressWarnings("PHPMD.CouplingBetweenObjects")
+ * @SuppressWarnings("PHPMD.CyclomaticComplexity")
+ * @SuppressWarnings("PHPMD.ExcessiveMethodLength")
  */
 class TextMessageHandler implements EventHandler
 {
diff --git a/src/laravel/test/Facades/FacadesTest.php b/src/laravel/test/Facades/FacadesTest.php
index 50d6098c..c306df92 100644
--- a/src/laravel/test/Facades/FacadesTest.php
+++ b/src/laravel/test/Facades/FacadesTest.php
@@ -19,14 +19,14 @@
 namespace LINE\Laravel\Tests\Facades;
 
 /**
- * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
+ * @SuppressWarnings("PHPMD.CouplingBetweenObjects")
  */
 class FacadesTest extends \Orchestra\Testbench\TestCase
 {
     /**
      * Load package service provider
      *
-     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     * @SuppressWarnings("PHPMD.UnusedFormalParameter")
      * @param  \Illuminate\Foundation\Application $app
      * @return array
      */
@@ -38,7 +38,7 @@ protected function getPackageProviders($app)
     /**
      * Load package alias
      *
-     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     * @SuppressWarnings("PHPMD.UnusedFormalParameter")
      * @param  \Illuminate\Foundation\Application $app
      * @return array
      */
@@ -69,7 +69,7 @@ public function testConfigLoaded()
     /**
      * Testing LINEBot facade instance
      *
-     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     * @SuppressWarnings("PHPMD.UnusedFormalParameter")
      * @return void
      */
     public function testLINEBotFacadeInstance()
diff --git a/src/parser/lib/EventRequestParser.php b/src/parser/lib/EventRequestParser.php
index e64bc275..5317560d 100644
--- a/src/parser/lib/EventRequestParser.php
+++ b/src/parser/lib/EventRequestParser.php
@@ -44,7 +44,7 @@
 use LINE\Webhook\Model\UserMentionee;
 
 /**
- * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
+ * @SuppressWarnings("PHPMD.CouplingBetweenObjects")
  */
 class EventRequestParser
 {
diff --git a/src/parser/test/EventRequestParserTest.php b/src/parser/test/EventRequestParserTest.php
index 58f8eb69..7967bc92 100644
--- a/src/parser/test/EventRequestParserTest.php
+++ b/src/parser/test/EventRequestParserTest.php
@@ -1234,11 +1234,10 @@ public function testParseEventRequest()
             $this->assertEquals('__unknown__', $event->jsonSerialize()->type); // with unprocessed event body
             $this->assertEquals(12345678901234, $event->getTimestamp());
             $this->assertEquals('active', $event->getMode());
-            $this->assertTrue($source instanceof UserSource);
+            $this->assertInstanceOf(UserSource::class, $source);
             $this->assertEquals('userid', $source->getUserId());
             $this->assertEquals('testwebhookeventid', $event->getWebhookEventId());
             $this->assertFalse($event->getDeliveryContext()->getIsRedelivery());
-            $this->assertEquals(true, $source instanceof UserSource);
         }
 
         {