diff --git a/composer.json b/composer.json
index e8f1a03..f7cae58 100644
--- a/composer.json
+++ b/composer.json
@@ -20,8 +20,8 @@
     },
     "require-dev": {
         "mink/driver-testsuite": "dev-master",
-        "phpstan/phpstan": "^1.10",
-        "phpstan/phpstan-phpunit": "^1.3",
+        "phpstan/phpstan": "^2",
+        "phpstan/phpstan-phpunit": "^2",
         "phpunit/phpunit": "^9.6.8",
         "symfony/error-handler": "^5.4 || ^6.0 || ^7.0",
         "symfony/process": "^5.4 || ^6.0 || ^7.0",
diff --git a/phpstan.dist.neon b/phpstan.dist.neon
index f0dc8e8..7639a1a 100644
--- a/phpstan.dist.neon
+++ b/phpstan.dist.neon
@@ -3,7 +3,7 @@ includes:
 	- vendor/phpstan/phpstan-phpunit/rules.neon
 
 parameters:
-	level: 9
+	level: 10
 	paths:
 		- src
 		- tests
@@ -26,3 +26,13 @@ parameters:
 			identifier: argument.type
 			count: 1
 			path: src/WebdriverClassicDriver.php
+		-
+			message: '#^Method Mink\\WebdriverClassicDriver\\WebdriverClassicDriver\:\:getWindowHandleFromName\(\) should return string but returns mixed\.$#'
+			identifier: return.type
+			count: 1
+			path: src/WebdriverClassicDriver.php
+		-
+			message: '#^Parameter \#1 \$handle of method Facebook\\WebDriver\\Remote\\RemoteTargetLocator\:\:window\(\) expects string, mixed given\.$#'
+			identifier: argument.type
+			count: 3
+			path: src/WebdriverClassicDriver.php
diff --git a/src/WebdriverClassicDriver.php b/src/WebdriverClassicDriver.php
index 47c18f7..1f3e7a8 100644
--- a/src/WebdriverClassicDriver.php
+++ b/src/WebdriverClassicDriver.php
@@ -670,10 +670,6 @@ public function executeScript(
         $this->getWebDriver()->executeScript($script);
     }
 
-    /**
-     * {@inheritdoc}
-     * @return mixed
-     */
     public function evaluateScript(
         #[Language('JavaScript')]
         string $script
@@ -971,7 +967,7 @@ private function executeJsOnXpath(
      * @throws DriverException
      */
     private function executeJsOnElement(
-        RemoteWebElement $element,
+        WebDriverElement $element,
         #[Language('JavaScript')]
         string $script
     ) {
@@ -1044,7 +1040,7 @@ private function getWindowHandleFromName(string $name): string
         }
     }
 
-    private function clickOnElement(RemoteWebElement $element): void
+    private function clickOnElement(WebDriverElement $element): void
     {
         $element->getLocationOnScreenOnceScrolledIntoView();
         $element->click();
@@ -1108,14 +1104,11 @@ private function withWindow(?string $name, callable $callback): void
      */
     private function findElement(
         #[Language('XPath')]
-        string $xpath,
-        ?RemoteWebElement $parent = null
+        string $xpath
     ): RemoteWebElement {
         try {
             $finder = WebDriverBy::xpath($xpath);
-            return $parent
-                ? $parent->findElement($finder)
-                : $this->getWebDriver()->findElement($finder);
+            return $this->getWebDriver()->findElement($finder);
         } catch (\Throwable $e) {
             throw new DriverException("Failed to find element: {$e->getMessage()}", 0, $e);
         }
@@ -1124,7 +1117,7 @@ private function findElement(
     /**
      * @throws DriverException
      */
-    private function selectRadioValue(RemoteWebElement $element, string $value): void
+    private function selectRadioValue(WebDriverElement $element, string $value): void
     {
         try {
             (new WebDriverRadios($element))->selectByValue($value);
@@ -1142,7 +1135,7 @@ private function selectRadioValue(RemoteWebElement $element, string $value): voi
     /**
      * @throws DriverException
      */
-    private function selectOptionOnElement(RemoteWebElement $element, string $value, bool $multiple = false): void
+    private function selectOptionOnElement(WebDriverElement $element, string $value, bool $multiple = false): void
     {
         try {
             $select = new WebDriverSelect($element);
@@ -1172,7 +1165,7 @@ private function selectOptionOnElement(RemoteWebElement $element, string $value,
      *
      * @throws DriverException
      */
-    private function deselectAllOptions(RemoteWebElement $element): void
+    private function deselectAllOptions(WebDriverElement $element): void
     {
         try {
             (new WebDriverSelect($element))->deselectAll();
@@ -1190,7 +1183,7 @@ private function deselectAllOptions(RemoteWebElement $element): void
      * @throws DriverException
      */
     private function ensureInputType(
-        RemoteWebElement $element,
+        WebDriverElement $element,
         #[Language('XPath')]
         string $xpath,
         string $type,
@@ -1233,7 +1226,7 @@ private function jsonEncode($value, string $action, string $field): string
      * @param mixed $value
      * @throws DriverException
      */
-    private function setElementDomProperty(RemoteWebElement $element, string $property, $value): void
+    private function setElementDomProperty(WebDriverElement $element, string $property, $value): void
     {
         $this->executeJsOnElement(
             $element,
diff --git a/tests/WebdriverClassicConfig.php b/tests/WebdriverClassicConfig.php
index f3d19bd..3dbd06d 100644
--- a/tests/WebdriverClassicConfig.php
+++ b/tests/WebdriverClassicConfig.php
@@ -21,7 +21,10 @@ public static function getInstance(): self
 
     public function createDriver(): WebdriverClassicDriver
     {
-        $seleniumHost = $_SERVER['DRIVER_URL'];
+        $seleniumHost = $_SERVER['DRIVER_URL'] ?? null;
+        if (!is_string($seleniumHost)) {
+            throw new \RuntimeException('Selenium host must be specified (as a string) in $_SERVER[DRIVER_URL].');
+        }
 
         return new WebdriverClassicDriver($this->getBrowserName(), [], $seleniumHost);
     }
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index d4d3a01..59207f1 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -4,9 +4,8 @@
 
 use Symfony\Component\Process\Process;
 
-$minkTestServerPort = isset($_SERVER['WEB_FIXTURES_HOST'])
-    ? parse_url($_SERVER['WEB_FIXTURES_HOST'], PHP_URL_PORT)
-    : '8002';
+$fixturesHost = $_SERVER['WEB_FIXTURES_HOST'] ?? '';
+$minkTestServerPort = parse_url(is_string($fixturesHost) ? $fixturesHost : '', PHP_URL_PORT) ?: '8002';
 
 $minkTestServer = new Process([
     PHP_BINARY,