diff --git a/composer.json b/composer.json
index 2090075024..4acfe7e41a 100644
--- a/composer.json
+++ b/composer.json
@@ -152,7 +152,7 @@
 		"mikey179/vfsstream": "^1.6",
 		"mockery/mockery": "^1.3",
 		"php-mock/php-mock-phpunit": "^2.10",
-		"phpstan/phpstan": "^1.12",
+		"phpstan/phpstan": "^2.0",
 		"phpunit/phpunit": "^9"
 	},
 	"scripts": {
diff --git a/composer.lock b/composer.lock
index 7d1e831b14..8d200a3f67 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": "11175d4e9806e8a5069d010140431af1",
+    "content-hash": "3e31a2243fb69e47e1b7000cca946fa2",
     "packages": [
         {
             "name": "asika/simple-console",
@@ -4834,20 +4834,20 @@
         },
         {
             "name": "phpstan/phpstan",
-            "version": "1.12.7",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "dc2b9976bd8b0f84ec9b0e50cc35378551de7af0"
+                "reference": "ab4e9b4415a5fc9e4d27f7fe16c8bc9d067dcd6d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/dc2b9976bd8b0f84ec9b0e50cc35378551de7af0",
-                "reference": "dc2b9976bd8b0f84ec9b0e50cc35378551de7af0",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/ab4e9b4415a5fc9e4d27f7fe16c8bc9d067dcd6d",
+                "reference": "ab4e9b4415a5fc9e4d27f7fe16c8bc9d067dcd6d",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.2|^8.0"
+                "php": "^7.4|^8.0"
             },
             "conflict": {
                 "phpstan/phpstan-shim": "*"
@@ -4888,7 +4888,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2024-10-18T11:12:07+00:00"
+            "time": "2024-11-11T15:43:04+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
diff --git a/src/Protocol/ActivityPub/Receiver.php b/src/Protocol/ActivityPub/Receiver.php
index 0f8184d3db..06bedd4eba 100644
--- a/src/Protocol/ActivityPub/Receiver.php
+++ b/src/Protocol/ActivityPub/Receiver.php
@@ -1899,7 +1899,10 @@ class Receiver
 		if (in_array(-1, $object_data['receiver'])) {
 			$object_data['unlisted'] = true;
 			unset($object_data['receiver'][-1]);
-			unset($object_data['reception_type'][-1]);
+
+			if (array_key_exists(-1, $object_data['reception_type'])) {
+				unset($object_data['reception_type'][-1]);
+			}
 		}
 
 		return $object_data;