diff --git a/.github/workflows/grumphp.yml b/.github/workflows/grumphp.yml
index 8d6bf141..842f6c14 100644
--- a/.github/workflows/grumphp.yml
+++ b/.github/workflows/grumphp.yml
@@ -8,7 +8,7 @@ jobs:
         strategy:
             matrix:
                 operating-system: ['ubuntu-latest']
-                php-versions: ['8.3', '8.4', '8.5']
+                php-versions: ['8.4', '8.5']
                 composer-options: ['', '--prefer-lowest']
             fail-fast: false
         name: PHP ${{ matrix.php-versions }} @ ${{ matrix.operating-system }} with ${{ matrix.composer-options }}
diff --git a/composer.json b/composer.json
index ab65e3ae..7839b151 100644
--- a/composer.json
+++ b/composer.json
@@ -12,14 +12,21 @@
         }
     ],
     "require": {
-        "php": "~8.3.0 || ~8.4.0 || ~8.5.0",
-        "php-standard-library/php-standard-library": "^3.0 || ^4.0 || ^5.0 || ^6.0",
+        "php": "~8.4.0 || ~8.5.0",
         "laminas/laminas-code": "^4.17.0",
-        "php-soap/cached-engine": "~0.6",
-        "php-soap/engine": "^2.19.0",
-        "php-soap/encoding": "~0.28",
-        "php-soap/psr18-transport": "^1.7",
-        "php-soap/wsdl-reader": "~0.31",
+        "php-soap/cached-engine": "~0.8",
+        "php-soap/encoding": "~0.32",
+        "php-soap/engine": "^2.20",
+        "php-soap/psr18-transport": "^2.0",
+        "php-soap/wsdl-reader": "~0.32",
+        "php-standard-library/dict": "^6.1",
+        "php-standard-library/foundation": "^6.1",
+        "php-standard-library/iter": "^6.1",
+        "php-standard-library/option": "^6.1",
+        "php-standard-library/result": "^6.1",
+        "php-standard-library/str": "^6.1",
+        "php-standard-library/type": "^6.1",
+        "php-standard-library/vec": "^6.1",
         "psr/event-dispatcher": "^1.0",
         "psr/log": "^1.0 || ^2.0 || ^3.0",
         "symfony/console": "~5.4 || ~6.0 || ~7.0 || ~8.0",
@@ -32,6 +39,7 @@
         "nyholm/psr7": "^1.5",
         "php-http/vcr-plugin": "^1.2",
         "php-parallel-lint/php-parallel-lint": "^1.4",
+        "php-standard-library/fun": "^6.1",
         "phpro/grumphp-shim": "^2.17",
         "phpspec/phpspec": "^8.2",
         "phpspec/prophecy-phpunit": "^2.0.1",