diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
new file mode 100644
index 0000000..3a9251f
--- /dev/null
+++ b/.github/FUNDING.yml
@@ -0,0 +1,3 @@
+# These are supported funding model platforms
+
+github: byjg
diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 290ff04..a781440 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -16,10 +16,9 @@ jobs:
     strategy:
       matrix:
         php-version:
+          - "8.3"
           - "8.2"
           - "8.1"
-          - "8.0"
-          - "7.4"
 
     steps:
       - uses: actions/checkout@v4
diff --git a/composer.json b/composer.json
index c86ed9b..4a4dede 100644
--- a/composer.json
+++ b/composer.json
@@ -9,11 +9,11 @@
   "prefer-stable": true,
   "minimum-stability": "dev",
   "require": {
-    "php": ">=7.4",
-    "byjg/anydataset": "4.9.*"
+    "php": ">=8.1 <8.4",
+    "byjg/anydataset": "^5.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "5.7.*|7.4.*|^9.5"
+    "phpunit/phpunit": "^9.6"
   },
   "provide": {
     "byjg/anydataset-implementation": "1.0"
diff --git a/src/ArrayDataset.php b/src/ArrayDataset.php
index f195b6a..5a81f65 100644
--- a/src/ArrayDataset.php
+++ b/src/ArrayDataset.php
@@ -4,7 +4,6 @@
 
 use ByJG\AnyDataset\Core\GenericIterator;
 use ByJG\AnyDataset\Core\IteratorFilter;
-use UnexpectedValueException;
 
 class ArrayDataset
 {
@@ -12,15 +11,15 @@ class ArrayDataset
     /**
      * @var array
      */
-    protected $array;
+    protected array $array;
     /**
-     * @var mixed|string
+     * @var string|null
      */
-    protected $propertyIndexName;
+    protected ?string $propertyIndexName;
     /**
-     * @var mixed|string
+     * @var string|null
      */
-    protected $propertyKeyName;
+    protected ?string $propertyKeyName;
 
     /**
      * Constructor Method
@@ -28,7 +27,7 @@ class ArrayDataset
      * @param array $array
      * @param string $property The name of the field if the item is not an array or object
      */
-    public function __construct(array $array, string $property = "value", $propertyIndexName = "__id", $propertyKeyName = "__key")
+    public function __construct(array $array, string $property = "value", ?string $propertyIndexName = "__id", ?string $propertyKeyName = "__key")
     {
         $this->propertyIndexName = $propertyIndexName;
         $this->propertyKeyName = $propertyKeyName;
@@ -44,7 +43,7 @@ public function __construct(array $array, string $property = "value", $propertyI
                 $result = array("__class" => get_class($value));
                 $methods = get_class_methods($value);
                 foreach ($methods as $method) {
-                    if (strpos($method, "get") === 0) {
+                    if (str_starts_with($method, "get")) {
                         $result[substr($method, 3)] = $value->{$method}();
                     }
                 }
@@ -58,10 +57,10 @@ public function __construct(array $array, string $property = "value", $propertyI
     /**
      * Return a GenericIterator
      *
-     * @param IteratorFilter $filter
+     * @param IteratorFilter|null $filter
      * @return GenericIterator
      */
-    public function getIterator($filter = null)
+    public function getIterator(IteratorFilter $filter = null): GenericIterator
     {
         return new ArrayDatasetIterator($this->array, $filter, $this->propertyIndexName, $this->propertyKeyName);
     }
diff --git a/src/ArrayDatasetIterator.php b/src/ArrayDatasetIterator.php
index e38f90e..79a8409 100644
--- a/src/ArrayDatasetIterator.php
+++ b/src/ArrayDatasetIterator.php
@@ -5,7 +5,6 @@
 use ByJG\AnyDataset\Core\GenericIterator;
 use ByJG\AnyDataset\Core\IteratorFilter;
 use ByJG\AnyDataset\Core\Row;
-use InvalidArgumentException;
 
 class ArrayDatasetIterator extends GenericIterator
 {
@@ -13,47 +12,46 @@ class ArrayDatasetIterator extends GenericIterator
     /**
      * @var array
      */
-    protected $rows;
+    protected array $rows;
 
     /**
      * Enter description here...
      *
      * @var array
      */
-    protected $keys;
+    protected array $keys;
 
     /**
       /* @var int
      */
-    protected $index;
+    protected int $index;
 
     /**
      * @var Row
      */
-    protected $currentRow;
+    protected ?Row $currentRow;
 
     /**
-     * @var IteratorFilter
+     * @var IteratorFilter|null
      */
-    protected $filter;
+    protected ?IteratorFilter $filter;
     /**
-     * @var mixed|string
+     * @var string|null
      */
-    protected $propertyIndexName;
+    protected ?string $propertyIndexName;
     /**
-     * @var mixed|string
+     * @var string|null
      */
-    protected $propertyKeyName;
+    protected ?string $propertyKeyName;
 
     /**
      * @param array $rows
-     * @param IteratorFilter $filter
+     * @param IteratorFilter|null $filter
+     * @param string|null $propertyIndexName
+     * @param string|null $propertyKeyName
      */
-    public function __construct($rows, $filter, $propertyIndexName = "__id", $propertyKeyName = "__key")
+    public function __construct(array $rows, ?IteratorFilter $filter, ?string $propertyIndexName = "__id", ?string $propertyKeyName = "__key")
     {
-        if (!is_array($rows)) {
-            throw new InvalidArgumentException("ArrayDatasetIterator must receive an array");
-        }
         $this->index = 0;
         $this->currentRow = null;
         $this->rows = $rows;
@@ -62,13 +60,12 @@ public function __construct($rows, $filter, $propertyIndexName = "__id", $proper
 
         $this->propertyIndexName = $propertyIndexName;
         $this->propertyKeyName = $propertyKeyName;
-
     }
 
     /**
      * @return int
      */
-    public function count()
+    public function count(): int
     {
         return count($this->rows);
     }
@@ -77,7 +74,7 @@ public function count()
      * @return bool
      * @throws \ByJG\Serializer\Exception\InvalidArgumentException
      */
-    public function hasNext()
+    public function hasNext(): bool
     {
         if (!empty($this->currentRow)) {
             return true;
@@ -114,10 +111,10 @@ public function hasNext()
     }
 
     /**
-     * @return Row
+     * @return Row|null
      * @throws \ByJG\Serializer\Exception\InvalidArgumentException
      */
-    public function moveNext()
+    public function moveNext(): ?Row
     {
         if (!$this->hasNext()) {
             return null;
@@ -129,7 +126,7 @@ public function moveNext()
         return $row;
     }
 
-    public function key()
+    public function key(): int
     {
         return $this->index;
     }