diff --git a/.github/workflows/php-cs-fixer.yml b/.github/workflows/php-cs-fixer.yml
new file mode 100644
index 0000000..2d37e13
--- /dev/null
+++ b/.github/workflows/php-cs-fixer.yml
@@ -0,0 +1,7 @@
+name: PHP CS Fixer
+
+on: push
+
+jobs:
+  fixers:
+    uses: humhub/actions/.github/workflows/module-php-cs-fixer.yml@main
diff --git a/Events.php b/Events.php
index 6890da7..57b6efc 100644
--- a/Events.php
+++ b/Events.php
@@ -50,7 +50,7 @@ public static function onAdminMenuInit($event): void
             'icon' => 'info-circle',
             'sortOrder' => 1000,
             'isActive' => (Yii::$app->controller->module && Yii::$app->controller->module->id == 'example-basic' && Yii::$app->controller->id == 'admin'),
-            'isVisible' => Yii::$app->user->can(ManageModules::class)
+            'isVisible' => Yii::$app->user->can(ManageModules::class),
         ]));
     }
 }
diff --git a/Module.php b/Module.php
index 5995a41..3bbce98 100644
--- a/Module.php
+++ b/Module.php
@@ -9,8 +9,8 @@ class Module extends \humhub\components\Module
     /**
      * @inheritdoc
      */
-    public $resourcesPath = 'resources';    
-    
+    public $resourcesPath = 'resources';
+
     /**
      * @inheritdoc
      */
diff --git a/assets/Assets.php b/assets/Assets.php
index c3de69a..f9ff1c7 100644
--- a/assets/Assets.php
+++ b/assets/Assets.php
@@ -17,14 +17,14 @@ class Assets extends AssetBundle
     public $publishOptions = [
         // TIPP: Change forceCopy to true when testing your js in order to rebuild
         // this assets on every request (otherwise they will be cached)
-        'forceCopy' => false
+        'forceCopy' => false,
     ];
 
     /**
      * @inheritdoc
      */
     public $js = [
-        'js/humhub.example-basic.js'
+        'js/humhub.example-basic.js',
     ];
 
-}
\ No newline at end of file
+}
diff --git a/config.php b/config.php
index 5f7603a..c6e2499 100644
--- a/config.php
+++ b/config.php
@@ -10,6 +10,6 @@
     'namespace' => 'acmeCorp\humhub\modules\exampleBasic',
     'events' => [
         [TopMenu::class, TopMenu::EVENT_INIT, [Events::class, 'onTopMenuInit']],
-        [AdminMenu::class, AdminMenu::EVENT_INIT, [Events::class, 'onAdminMenuInit']]
+        [AdminMenu::class, AdminMenu::EVENT_INIT, [Events::class, 'onAdminMenuInit']],
     ],
 ];
diff --git a/controllers/AdminController.php b/controllers/AdminController.php
index 053690b..b9a6d04 100644
--- a/controllers/AdminController.php
+++ b/controllers/AdminController.php
@@ -6,7 +6,6 @@
 
 class AdminController extends Controller
 {
-
     /**
      * Render admin only page
      *
@@ -18,4 +17,3 @@ public function actionIndex()
     }
 
 }
-
diff --git a/controllers/IndexController.php b/controllers/IndexController.php
index 0dac80b..c3c075f 100644
--- a/controllers/IndexController.php
+++ b/controllers/IndexController.php
@@ -6,7 +6,6 @@
 
 class IndexController extends Controller
 {
-
     /**
      * Renders the index view for the module
      *
@@ -18,4 +17,3 @@ public function actionIndex()
     }
 
 }
-
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index ad3aa1c..1f58ce6 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -4,6 +4,7 @@ Changelog
 1.0.2 (Unreleased)
 ----------------------
 - Enh #5: Add `requirements.php`
+- Enh #9: Use PHP CS Fixer
 
 1.0.1 (April 19, 2021)
 ----------------------
diff --git a/tests/codeception/_support/UnitTester.php b/tests/codeception/_support/UnitTester.php
index efd911a..bc33039 100644
--- a/tests/codeception/_support/UnitTester.php
+++ b/tests/codeception/_support/UnitTester.php
@@ -26,7 +26,7 @@ class UnitTester extends \UnitTester
 {
     use _generated\UnitTesterActions;
 
-   /**
-    * Define custom actions here
-    */
+    /**
+     * Define custom actions here
+     */
 }
diff --git a/tests/codeception/acceptance/AdminAreaCest.php b/tests/codeception/acceptance/AdminAreaCest.php
index d37eebf..d2bd92d 100644
--- a/tests/codeception/acceptance/AdminAreaCest.php
+++ b/tests/codeception/acceptance/AdminAreaCest.php
@@ -6,7 +6,6 @@
 
 class AdminAreaCest
 {
-
     public function testAdminInfoPage(AcceptanceTester $I)
     {
         $I->wantTo('see admin info page');
diff --git a/tests/codeception/config/unit.php b/tests/codeception/config/unit.php
index 44c0233..15d0428 100644
--- a/tests/codeception/config/unit.php
+++ b/tests/codeception/config/unit.php
@@ -1,3 +1,3 @@
 <?php
 
-return \tests\codeception\_support\HumHubTestConfiguration::getSuiteConfig('unit');
\ No newline at end of file
+return \tests\codeception\_support\HumHubTestConfiguration::getSuiteConfig('unit');
diff --git a/tests/codeception/functional/IndexPageCest.php b/tests/codeception/functional/IndexPageCest.php
index 896b406..81f41eb 100644
--- a/tests/codeception/functional/IndexPageCest.php
+++ b/tests/codeception/functional/IndexPageCest.php
@@ -11,15 +11,16 @@
 
 class IndexPageCest
 {
-
-    public function testTopMenu(FunctionalTester $I) {
+    public function testTopMenu(FunctionalTester $I)
+    {
         $I->wantTo('see top menu entry');
         $I->amUser();
         $I->amOnDashboard();
         $I->see('EXAMPLE');
     }
 
-    public function testIndexPage(FunctionalTester $I) {
+    public function testIndexPage(FunctionalTester $I)
+    {
         $I->wantTo('go to module page');
         $I->amAdmin();
         $I->amOnDashboard();
diff --git a/tests/codeception/unit/CalculatorTest.php b/tests/codeception/unit/CalculatorTest.php
index d52b063..7030748 100644
--- a/tests/codeception/unit/CalculatorTest.php
+++ b/tests/codeception/unit/CalculatorTest.php
@@ -12,4 +12,4 @@ public function testAddition()
         $this->assertTrue((2 !== 3));
     }
 
-}
\ No newline at end of file
+}
diff --git a/tests/config/test.php b/tests/config/test.php
index 59b0d10..b542547 100644
--- a/tests/config/test.php
+++ b/tests/config/test.php
@@ -10,5 +10,5 @@
     'fixtures' => [
         'default',
         //'exam' => 'acmeCorp\humhub\modules\exampleBasic\tests\codeception\fixtures\ExamFixture',
-    ]
+    ],
 ];