diff --git a/src/Client.php b/src/Client.php
index 090e8401..3133fe68 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -190,7 +190,10 @@ public function setServerParameter($key, $value): void
         throw new \InvalidArgumentException('Server parameters cannot be set when using WebDriver.');
     }
 
-    public function getServerParameter($key, $default = '')
+    /**
+     * @return mixed
+     */
+    public function getServerParameter($key, $default = ''): mixed
     {
         throw new \InvalidArgumentException('Server parameters cannot be retrieved when using WebDriver.');
     }
diff --git a/src/WebTestAssertionsTrait.php b/src/WebTestAssertionsTrait.php
index ac876849..7382e136 100644
--- a/src/WebTestAssertionsTrait.php
+++ b/src/WebTestAssertionsTrait.php
@@ -275,9 +275,9 @@ private static function findElement(string $locator): WebDriverElement
      * @param array $options An array of options to pass to the createKernel method
      * @param array $server  An array of server parameters
      *
-     * @return AbstractBrowser A browser instance
+     * @return KernelBrowser A browser instance
      */
-    protected static function createClient(array $options = [], array $server = []): AbstractBrowser
+    protected static function createClient(array $options = [], array $server = []): KernelBrowser
     {
         $kernel = static::bootKernel($options);