diff --git a/src/Server.php b/src/Server.php
index 1bd4bf6..f3481bc 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -47,6 +47,7 @@ abstract class Server
      * @var array<int, string>
      */
     protected array $supportedProtocolVersion = [
+        '2025-11-25',
         '2025-06-18',
         '2025-03-26',
         '2024-11-05',
diff --git a/tests/Pest.php b/tests/Pest.php
index 3c875ae..10140ef 100644
--- a/tests/Pest.php
+++ b/tests/Pest.php
@@ -69,7 +69,7 @@ function expectedInitializeResponse(): array
         'jsonrpc' => '2.0',
         'id' => 456,
         'result' => [
-            'protocolVersion' => '2025-06-18',
+            'protocolVersion' => '2025-11-25',
             'capabilities' => $capabilities,
             'serverInfo' => [
                 'name' => $name,