diff --git a/.github/workflows/analyzers.yaml b/.github/workflows/analyzers.yaml
index b67d45e..42ff949 100644
--- a/.github/workflows/analyzers.yaml
+++ b/.github/workflows/analyzers.yaml
@@ -7,7 +7,8 @@ jobs:
         strategy:
             matrix:
                 operating-system: [ubuntu-latest]
-                php-versions: ['8.1', '8.2', '8.3']
+                php-versions: [ '8.2', '8.3', '8.4' ]
+                composer-options: [ '--ignore-platform-req=php+' ]
             fail-fast: false
         name: PHP ${{ matrix.php-versions }} @ ${{ matrix.operating-system }}
         steps:
diff --git a/.github/workflows/code-style.yaml b/.github/workflows/code-style.yaml
index 923d306..65e0c34 100644
--- a/.github/workflows/code-style.yaml
+++ b/.github/workflows/code-style.yaml
@@ -7,7 +7,8 @@ jobs:
         strategy:
             matrix:
                 operating-system: [ubuntu-latest]
-                php-versions: ['8.1', '8.2', '8.3']
+                php-versions: [ '8.2', '8.3', '8.4' ]
+                composer-options: [ '--ignore-platform-req=php+' ]
             fail-fast: false
         name: PHP ${{ matrix.php-versions }} @ ${{ matrix.operating-system }}
         steps:
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 5ca67f3..f819719 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -7,7 +7,8 @@ jobs:
         strategy:
             matrix:
                 operating-system: [ubuntu-latest]
-                php-versions: ['8.1', '8.2', '8.3']
+                php-versions: [ '8.2', '8.3', '8.4' ]
+                composer-options: [ '--ignore-platform-req=php+' ]
                 dependency-preference: ['current', 'lowest', 'stable']
             fail-fast: false
         name: PHP ${{ matrix.php-versions }} ${{ matrix.dependency-preference }} deps @ ${{ matrix.operating-system }}
@@ -21,6 +22,6 @@ jobs:
                   tools: 'composer:v2'
                   extensions: pcov, mbstring, posix, dom, soap
             - name: Install dependencies
-              run: composer update --prefer-dist --no-progress --no-suggest ${{ matrix.dependency-preference == 'lowest' && '--prefer-lowest' || '' }} ${{ matrix.dependency-preference == 'stable' && '--prefer-stable' || '' }}
+              run: composer update --prefer-dist --no-progress --no-suggest ${{ matrix.dependency-preference == 'lowest' && '--prefer-lowest' || '' }} ${{ matrix.dependency-preference == 'stable' && '--prefer-stable' || '' }} ${{ matrix.composer-options }}
             - name: Run the tests
               run: ./vendor/bin/phpunit
diff --git a/.phive/phars.xml b/.phive/phars.xml
index e3b38d5..4aa93da 100644
--- a/.phive/phars.xml
+++ b/.phive/phars.xml
@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phive xmlns="https://phar.io/phive">
-  <phar name="php-cs-fixer" version="^3.58.1" installed="3.58.1" location="./tools/php-cs-fixer.phar" copy="true"/>
+  <phar name="php-cs-fixer" version="^3.13.0" installed="3.64.0" location="./tools/php-cs-fixer.phar" copy="true"/>
 </phive>
diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index f246a54..763952b 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -55,5 +55,6 @@
         'strict_comparison' => true,
         'strict_param' => true,
         'native_function_invocation' => true,
+        'nullable_type_declaration_for_default_null_value' => true,
     ])
 ;
diff --git a/composer.json b/composer.json
index 2ae4f09..221170e 100644
--- a/composer.json
+++ b/composer.json
@@ -20,22 +20,22 @@
         }
     ],
     "require": {
-        "php": "~8.1.0 || ~8.2.0 || ~8.3.0",
-        "azjezz/psl": "^2.9.0",
-        "veewee/reflecta": "~0.6",
-        "veewee/xml": "^3.1",
-        "php-soap/engine": "^2.9",
-        "php-soap/wsdl": "^1.6",
-        "php-soap/xml": "^1.7",
-        "php-soap/wsdl-reader": "~0.15"
+        "php": "~8.2.0 || ~8.3.0 || ~8.4.0",
+        "azjezz/psl": "^3.0",
+        "veewee/reflecta": "~0.10",
+        "veewee/xml": "^3.3",
+        "php-soap/engine": "^2.13",
+        "php-soap/wsdl": "^1.12",
+        "php-soap/xml": "^1.8",
+        "php-soap/wsdl-reader": "~0.18"
     },
     "require-dev": {
-        "vimeo/psalm": "^5.16",
+        "vimeo/psalm": "^5.26",
         "phpunit/phpunit": "^10.5",
         "symfony/var-dumper": "^7.0 || ^6.4",
         "php-standard-library/psalm-plugin": "^2.3",
-        "php-soap/engine-integration-tests": "^1.8.1",
-        "php-soap/psr18-transport": "^1.6",
+        "php-soap/engine-integration-tests": "^1.9",
+        "php-soap/psr18-transport": "^1.7",
         "guzzlehttp/guzzle": "^7.8"
     },
     "config": {
diff --git a/src/Exception/RestrictionException.php b/src/Exception/RestrictionException.php
index 33fef0a..5f0979e 100644
--- a/src/Exception/RestrictionException.php
+++ b/src/Exception/RestrictionException.php
@@ -8,6 +8,7 @@
 use Soap\Encoding\Formatter\QNameFormatter;
 use Soap\Engine\Metadata\Model\XsdType;
 use function is_scalar;
+use function sprintf;
 
 final class RestrictionException extends InvalidArgumentException implements ExceptionInterface
 {
diff --git a/src/TypeInference/XsiTypeDetector.php b/src/TypeInference/XsiTypeDetector.php
index 614ceed..14a3e8a 100644
--- a/src/TypeInference/XsiTypeDetector.php
+++ b/src/TypeInference/XsiTypeDetector.php
@@ -17,6 +17,7 @@
 use function is_string;
 use function Psl\Option\none;
 use function Psl\Option\some;
+use function sprintf;
 
 final class XsiTypeDetector
 {
diff --git a/tools/php-cs-fixer.phar b/tools/php-cs-fixer.phar
index efc1559..d071fa5 100755
Binary files a/tools/php-cs-fixer.phar and b/tools/php-cs-fixer.phar differ