diff --git a/composer.json b/composer.json
index 0ea262a..cd1156c 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
         }
     },
     "require": {
-        "minishlink/web-push": "v9.0.2"
+        "minishlink/web-push": "v9.0.4"
     },
     "require-dev": {
         "bamarni/composer-bin-plugin": "^1.8"
diff --git a/composer.lock b/composer.lock
index b0c77fe..6f3593a 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": "52984703eb2467ab8c658971d9fb70d5",
+    "content-hash": "fbab57ed390b47aa6cfd46c5a0d234ac",
     "packages": [
         {
             "name": "brick/math",
@@ -393,16 +393,16 @@
         },
         {
             "name": "minishlink/web-push",
-            "version": "v9.0.2",
+            "version": "v9.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/web-push-libs/web-push-php.git",
-                "reference": "9c9623bf2f455015cb03f21f175cd42345e039a0"
+                "reference": "f979f40b0017d2f86d82b9f21edbc515d031cc23"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/web-push-libs/web-push-php/zipball/9c9623bf2f455015cb03f21f175cd42345e039a0",
-                "reference": "9c9623bf2f455015cb03f21f175cd42345e039a0",
+                "url": "https://api.github.com/repos/web-push-libs/web-push-php/zipball/f979f40b0017d2f86d82b9f21edbc515d031cc23",
+                "reference": "f979f40b0017d2f86d82b9f21edbc515d031cc23",
                 "shasum": ""
             },
             "require": {
@@ -410,15 +410,17 @@
                 "ext-json": "*",
                 "ext-mbstring": "*",
                 "ext-openssl": "*",
-                "guzzlehttp/guzzle": "^7.4.5",
+                "guzzlehttp/guzzle": "^7.9.2",
                 "php": ">=8.1",
                 "spomky-labs/base64url": "^2.0.4",
+                "symfony/polyfill-php82": "^v1.31.0",
                 "web-token/jwt-library": "^3.3.0|^4.0.0"
             },
             "require-dev": {
-                "friendsofphp/php-cs-fixer": "^v3.68.3",
-                "phpstan/phpstan": "^1.10.57",
-                "phpunit/phpunit": "^10.5.9"
+                "friendsofphp/php-cs-fixer": "^v3.91.3",
+                "phpstan/phpstan": "^2.1.2",
+                "phpunit/phpunit": "^10.5.44|^11.5.6",
+                "symfony/polyfill-iconv": "^1.33"
             },
             "suggest": {
                 "ext-bcmath": "Optional for performance.",
@@ -452,9 +454,9 @@
             ],
             "support": {
                 "issues": "https://github.com/web-push-libs/web-push-php/issues",
-                "source": "https://github.com/web-push-libs/web-push-php/tree/v9.0.2"
+                "source": "https://github.com/web-push-libs/web-push-php/tree/v9.0.4"
             },
-            "time": "2025-01-29T17:44:07+00:00"
+            "time": "2025-12-10T14:00:12+00:00"
         },
         {
             "name": "psr/clock",
@@ -950,29 +952,22 @@
             "time": "2024-09-25T14:21:43+00:00"
         },
         {
-            "name": "symfony/polyfill-mbstring",
+            "name": "symfony/polyfill-php82",
             "version": "v1.33.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "6d857f4d76bd4b343eac26d6b539585d2bc56493"
+                "url": "https://github.com/symfony/polyfill-php82.git",
+                "reference": "5d2ed36f7734637dacc025f179698031951b1692"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/6d857f4d76bd4b343eac26d6b539585d2bc56493",
-                "reference": "6d857f4d76bd4b343eac26d6b539585d2bc56493",
+                "url": "https://api.github.com/repos/symfony/polyfill-php82/zipball/5d2ed36f7734637dacc025f179698031951b1692",
+                "reference": "5d2ed36f7734637dacc025f179698031951b1692",
                 "shasum": ""
             },
             "require": {
-                "ext-iconv": "*",
                 "php": ">=7.2"
             },
-            "provide": {
-                "ext-mbstring": "*"
-            },
-            "suggest": {
-                "ext-mbstring": "For best performance"
-            },
             "type": "library",
             "extra": {
                 "thanks": {
@@ -985,8 +980,11 @@
                     "bootstrap.php"
                 ],
                 "psr-4": {
-                    "Symfony\\Polyfill\\Mbstring\\": ""
-                }
+                    "Symfony\\Polyfill\\Php82\\": ""
+                },
+                "classmap": [
+                    "Resources/stubs"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -1002,17 +1000,16 @@
                     "homepage": "https://symfony.com/contributors"
                 }
             ],
-            "description": "Symfony polyfill for the Mbstring extension",
+            "description": "Symfony polyfill backporting some PHP 8.2+ features to lower PHP versions",
             "homepage": "https://symfony.com",
             "keywords": [
                 "compatibility",
-                "mbstring",
                 "polyfill",
                 "portable",
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.33.0"
+                "source": "https://github.com/symfony/polyfill-php82/tree/v1.33.0"
             },
             "funding": [
                 {
@@ -1032,7 +1029,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-12-23T08:48:59+00:00"
+            "time": "2024-09-09T11:45:10+00:00"
         },
         {
             "name": "web-token/jwt-library",
@@ -1185,10 +1182,10 @@
     ],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {},
     "prefer-stable": false,
     "prefer-lowest": false,
-    "platform": [],
-    "platform-dev": [],
-    "plugin-api-version": "2.3.0"
+    "platform": {},
+    "platform-dev": {},
+    "plugin-api-version": "2.9.0"
 }