diff --git a/SECURITY.md b/SECURITY.md
index 1339b490..e72f271e 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -2,12 +2,13 @@
 
 ## Supported Versions
 
-| Version | Supported          |
-|---------|--------------------|
-| 5.x     | :white_check_mark: |
-| 4.x     | :white_check_mark: |
-| 3.x     | :x:                |
-| <= 2.0  | :x:                |
+| Version | Supported                     |
+|---------|-------------------------------|
+| 6.x     | :white_check_mark:            |
+| 5.x     | :white_check_mark:            |
+| 4.x     | :warning: (security-fix only) |
+| 3.x     | :x:                           |
+| <= 2.0  | :x:                           |
 
 ## Reporting Potential Security Issues
 
diff --git a/test/Unit/App/Middleware/AuthorizationMiddlewareTest.php b/test/Unit/App/Middleware/AuthorizationMiddlewareTest.php
index cc6dfd11..e565f345 100644
--- a/test/Unit/App/Middleware/AuthorizationMiddlewareTest.php
+++ b/test/Unit/App/Middleware/AuthorizationMiddlewareTest.php
@@ -31,7 +31,7 @@
 
 class AuthorizationMiddlewareTest extends TestCase
 {
-    private Subject|MockObject $subject;
+    private Subject $subject;
     private UserRepository|MockObject $userRepository;
     private AdminRepository|MockObject $adminRepository;
     private AuthorizationInterface|MockObject $authorization;
diff --git a/test/Unit/App/Middleware/DeprecationMiddlewareTest.php b/test/Unit/App/Middleware/DeprecationMiddlewareTest.php
index c561891d..e49f00a0 100644
--- a/test/Unit/App/Middleware/DeprecationMiddlewareTest.php
+++ b/test/Unit/App/Middleware/DeprecationMiddlewareTest.php
@@ -32,7 +32,7 @@
 
 class DeprecationMiddlewareTest extends TestCase
 {
-    private Subject|MockObject $subject;
+    private Subject $subject;
     private ServerRequestInterface|MockObject $request;
     private RequestHandlerInterface|MockObject $handler;
     private ResponseInterface $response;
diff --git a/test/Unit/User/Service/UserServiceTest.php b/test/Unit/User/Service/UserServiceTest.php
index 5d1228e9..6b7324ab 100644
--- a/test/Unit/User/Service/UserServiceTest.php
+++ b/test/Unit/User/Service/UserServiceTest.php
@@ -29,7 +29,7 @@
 
 class UserServiceTest extends TestCase
 {
-    private Subject|MockObject $subject;
+    private Subject $subject;
     private UserRoleService|MockObject $userRoleService;
     private UserRepository|MockObject $userRepository;
     private UserDetailRepository|MockObject $userDetailRepository;