diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0dd2959..ea5e027 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [ "8.0", "8.1", "8.2" ]
+        php: [ "8.0", "8.1", "8.2", "8.3", "8.4" ]
 
     runs-on: ubuntu-latest
     name: PHP@${{ matrix.php }}
diff --git a/.gitignore b/.gitignore
index cca6cbd..4732bab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,5 +2,6 @@ vendor/
 coverage/
 composer.lock
 .phpunit.result.cache
+.phpunit.cache
 coverage.xml
 junit.xml
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5787589..6e6df95 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [5.0.1] - 2025-01-09
+### Added
+- Support for PHP 8.3. and PHP 8.4.
+
+### Changed
+- Code improvements to avoid type errors on runtime
+- Implicitly nullable parameters to nullable (PHP 8.4 deprecation)
+
 ## [5.0.0] - 2023-03-01
 ### Added
 - Support for PHP 8.2.
diff --git a/composer.json b/composer.json
index 92824fb..0e1c976 100644
--- a/composer.json
+++ b/composer.json
@@ -21,13 +21,13 @@
         }
     },
     "require": {
-        "php": "8.0.* | 8.1.* | 8.2.*",
+        "php": "8.0.* | 8.1.* | 8.2.* | 8.3.* | 8.4.*",
         "php-di/phpdoc-reader": "^2.1"
     },
     "require-dev": {
         "laravel/pint": "^1.5 | ^1.6",
-        "pestphp/pest": "^1.22",
-        "phpstan/phpstan": "^1.10"
+        "pestphp/pest": "^1.22 | ^2.0 | ^3.0",
+        "phpstan/phpstan": "^1.10 | ^2.0"
     },
     "scripts": {
         "analyse": "phpstan analyse --memory-limit 512M",
diff --git a/phpstan.neon b/phpstan.neon
index c29b9d4..4dc5d4d 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -2,4 +2,6 @@ parameters:
     paths:
         - src
     level: max
-    checkMissingIterableValueType: false
+    checkExplicitMixed: false
+    ignoreErrors:
+        - identifier: missingType.iterableValue
diff --git a/phpunit.xml b/phpunit.xml
index 3bb4563..b9fc08d 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,17 +1,13 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="./vendor/phpunit/phpunit/phpunit.xsd"
-         colors="true"
-         verbose="true"
->
-    <testsuites>
-        <testsuite name="Json Decoder Test Suite">
-            <directory>./tests</directory>
-        </testsuite>
-    </testsuites>
-    <coverage processUncoveredFiles="true">
-        <include>
-            <directory suffix=".php">./src</directory>
-        </include>
-    </coverage>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="./vendor/phpunit/phpunit/phpunit.xsd" colors="true" cacheDirectory=".phpunit.cache">
+  <testsuites>
+    <testsuite name="Json Decoder Test Suite">
+      <directory>./tests</directory>
+    </testsuite>
+  </testsuites>
+  <source>
+    <include>
+      <directory suffix=".php">./src</directory>
+    </include>
+  </source>
 </phpunit>
diff --git a/src/Bindings/DateTimeBinding.php b/src/Bindings/DateTimeBinding.php
index f703ca0..c53e268 100644
--- a/src/Bindings/DateTimeBinding.php
+++ b/src/Bindings/DateTimeBinding.php
@@ -22,6 +22,9 @@ public function __construct(
     public function validate(array $jsonData): bool
     {
         if ($this->jsonField && array_key_exists($this->jsonField, $jsonData) && ! empty($jsonData[$this->jsonField])) {
+            if (! is_string($jsonData[$this->jsonField])) {
+                return false;
+            }
             return DateTime::createFromFormat($this->dateTimeFormat, $jsonData[$this->jsonField]) !== false;
         }
 
@@ -31,10 +34,12 @@ public function validate(array $jsonData): bool
     public function bind(JsonDecoder $jsonDecoder, Property $property, array $jsonData = []): void
     {
         if ($this->jsonField && array_key_exists($this->jsonField, $jsonData)) {
-            $dateTimeObject = DateTime::createFromFormat($this->dateTimeFormat, $jsonData[$this->jsonField]);
+            if (is_string($jsonData[$this->jsonField])) {
+                $dateTimeObject = DateTime::createFromFormat($this->dateTimeFormat, $jsonData[$this->jsonField]);
 
-            if ($dateTimeObject !== false) {
-                $property->set($dateTimeObject);
+                if ($dateTimeObject !== false) {
+                    $property->set($dateTimeObject);
+                }
             }
         }
     }
diff --git a/src/Bindings/FieldBinding.php b/src/Bindings/FieldBinding.php
index 88314e4..c9496ad 100644
--- a/src/Bindings/FieldBinding.php
+++ b/src/Bindings/FieldBinding.php
@@ -12,7 +12,9 @@ public function bind(JsonDecoder $jsonDecoder, Property $property, array $jsonDa
     {
         if ($this->jsonField && array_key_exists($this->jsonField, $jsonData) && $this->type) {
             $data = $jsonData[$this->jsonField];
-            $property->set($jsonDecoder->decodeArray($data, $this->type));
+            if (is_null($data) || is_array($data)) {
+                $property->set($jsonDecoder->decodeArray($data, $this->type));
+            }
         }
     }
 }
diff --git a/src/JsonDecoder.php b/src/JsonDecoder.php
index 24207a6..2721a2f 100644
--- a/src/JsonDecoder.php
+++ b/src/JsonDecoder.php
@@ -60,7 +60,7 @@ public function scanAndRegister(string $class): void
      * @throws JsonValueException
      * @throws ReflectionException
      */
-    public function decode(string $json, string $classType, string $root = null): mixed
+    public function decode(string $json, string $classType, ?string $root = null): mixed
     {
         return $this->decodeArray($this->parseJson($json, $root), $classType);
     }
@@ -73,13 +73,13 @@ public function decode(string $json, string $classType, string $root = null): mi
      * @throws JsonValueException
      * @throws ReflectionException
      */
-    public function decodeMultiple(string $json, string $classType, string $root = null): array
+    public function decodeMultiple(string $json, string $classType, ?string $root = null): array
     {
         $data = $this->parseJson($json, $root);
 
         return array_map(
             function ($element) use ($classType) {
-                return $this->decodeArray($element, $classType);
+                return is_array($element) ? $this->decodeArray($element, $classType) : $this->decodeArray(null, $classType);
             },
             $data
         );
diff --git a/src/Property.php b/src/Property.php
index 14e2978..8d0f845 100644
--- a/src/Property.php
+++ b/src/Property.php
@@ -108,8 +108,10 @@ private function typesMatch(?ReflectionType $reflectionType, mixed $value): bool
 
         if ($reflectionType instanceof ReflectionUnionType) {
             foreach ($reflectionType->getTypes() as $type) {
-                if ($type->getName() === $valueType) {
-                    return true;
+                if ($type instanceof ReflectionNamedType) {
+                    if ($type->getName() === $valueType) {
+                        return true;
+                    }
                 }
             }
         }
diff --git a/tests/PropertyTest.php b/tests/PropertyTest.php
index 43a204e..d1af7f1 100644
--- a/tests/PropertyTest.php
+++ b/tests/PropertyTest.php
@@ -14,17 +14,11 @@
         expect($sample->{$propertyName})->toEqual('value');
     }
 })->with([
-    'public' => [
-        'name' => 'publicProperty',
-    ],
-    'protected' => [
-        'name' => 'protectedProperty',
-    ],
-    'private' => [
-        'name' => 'privateProperty',
-    ],
+    'public' => ['publicProperty'],
+    'protected' => ['protectedProperty'],
+    'private' => ['privateProperty'],
     'new' => [
-        'name' => 'newProperty',
+        'newProperty',
         'methodAccess' => false,
     ],
 ]);