diff --git a/Resources/Private/CodeExamples/Tests/Unit/Controller/FrontendUserControllerTest.php b/Resources/Private/CodeExamples/Tests/Unit/Controller/FrontendUserControllerTest.php
index 542116a..a9e33f1 100644
--- a/Resources/Private/CodeExamples/Tests/Unit/Controller/FrontendUserControllerTest.php
+++ b/Resources/Private/CodeExamples/Tests/Unit/Controller/FrontendUserControllerTest.php
@@ -40,7 +40,7 @@ class FrontendUserControllerTest extends TestCase
      */
     protected $viewMock;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->subject = new FrontendUserController();
         $this->viewMock = $this->getMockBuilder(ViewInterface::class)->getMock();
diff --git a/composer.json b/composer.json
index 20a6ce8..943e5c5 100644
--- a/composer.json
+++ b/composer.json
@@ -15,15 +15,15 @@
         }
     },
     "require": {
-        "typo3/cms-core": "^8.7"
+        "typo3/cms-core": "^9.5",
+        "typo3/cms-extbase": "^9.5"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^8.0"
     },
     "extra": {
         "typo3/cms": {
             "web-dir": "web"
         }
-    },
-    "require-dev": {
-        "phpunit/phpunit": "^6.5",
-        "infection/infection": "^0.9.0"
     }
 }
diff --git a/readme.rst b/readme.rst
index e8e6e03..5fec70d 100644
--- a/readme.rst
+++ b/readme.rst
@@ -42,8 +42,6 @@ Installation development dependencies using composer::
 
 This also includes PHPUnit, see: composer.json
 
-We use 6.x to support PHP 7.0.
-
 Check installation::
 
    ./vendor/bin/phpunit --version
@@ -58,6 +56,10 @@ Links:
 
 * https://packagist.org/packages/phpunit/phpunit
 
+.. note::
+
+   The concrete PHPUnit version also depends on your current PHP Version.
+
 Create first test
 -----------------