diff --git a/composer.json b/composer.json
index e882858..e2f7062 100644
--- a/composer.json
+++ b/composer.json
@@ -9,12 +9,12 @@
         }
     ],
     "require": {
-      "php": ">=5.3",
+      "php": ">8.0",
       "ext-curl": "*"
     },
     "require-dev": {
         "phpunit/phpunit": "~3.7.",
-        "mikey179/vfsStream": "*"
+        "mikey179/vfsstream": "*"
     },
     "autoload": {
         "psr-0": {
diff --git a/library/SSRS/Object/ArrayIterator.php b/library/SSRS/Object/ArrayIterator.php
index 8171642..11be377 100755
--- a/library/SSRS/Object/ArrayIterator.php
+++ b/library/SSRS/Object/ArrayIterator.php
@@ -11,28 +11,28 @@ class ArrayIterator extends ObjectAbstract implements \Iterator {
 
     public $iteratorKey = 'Array';
 
-    public function next() {
-        return next($this->data[$this->iteratorKey]);
+    public function next(): void {
+        next($this->data[$this->iteratorKey]);
     }
 
     public function prev() {
         return prev($this->data[$this->iteratorKey]);
     }
 
-    public function key() {
+    public function key(): mixed {
         return key($this->data[$this->iteratorKey]);
     }
 
-    public function current() {
+    public function current(): mixed {
         return current($this->data[$this->iteratorKey]);
     }
 
-    public function valid() {
+    public function valid(): bool {
         return isset($this->data[$this->iteratorKey][$this->key()]);
     }
 
-    public function rewind() {
-        return reset($this->data[$this->iteratorKey]);
+    public function rewind(): void {
+        reset($this->data[$this->iteratorKey]);
     }
 
-}
+}
\ No newline at end of file
diff --git a/library/SSRS/Soap/NTLM.php b/library/SSRS/Soap/NTLM.php
index cd00970..66709bc 100755
--- a/library/SSRS/Soap/NTLM.php
+++ b/library/SSRS/Soap/NTLM.php
@@ -130,7 +130,7 @@ public function getCurlOptions() {
         return $this->_curlOptions;
     }
 
-    public function __doRequest($request, $location, $action, $version = 1, $one_way = null) {
+    public function __doRequest($request, $location, $action, $version = 1, $one_way = null): ?string {
         $this->_lastRequest = (string) $request;
         $this->_lastResponse = $this->callCurl($location, $request, $action);
         return $this->_lastResponse;