diff --git a/composer.json b/composer.json
index b2234c8..e700801 100644
--- a/composer.json
+++ b/composer.json
@@ -27,6 +27,7 @@
     "ergebnis/composer-normalize": "^2.28.3",
     "ergebnis/license": "^2.4.0",
     "ergebnis/php-cs-fixer-config": "^6.13.0",
+    "ergebnis/phpunit-slow-test-detector": "^2.6.0",
     "infection/infection": "~0.26.6",
     "phpunit/phpunit": "^9.6.13",
     "psalm/plugin-phpunit": "~0.18.4",
diff --git a/composer.lock b/composer.lock
index 4c05a91..96c098d 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "4dd6a6230c2218dfde6e4acde437c637",
+    "content-hash": "ce8a6af215ef951da6019742fba7ef14",
     "packages": [
         {
             "name": "fakerphp/faker",
@@ -1196,6 +1196,73 @@
             },
             "time": "2023-11-30T09:24:19+00:00"
         },
+        {
+            "name": "ergebnis/phpunit-slow-test-detector",
+            "version": "2.6.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/ergebnis/phpunit-slow-test-detector.git",
+                "reference": "3687a9720d31b8ff0f4bf9c963d02faef729c393"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/ergebnis/phpunit-slow-test-detector/zipball/3687a9720d31b8ff0f4bf9c963d02faef729c393",
+                "reference": "3687a9720d31b8ff0f4bf9c963d02faef729c393",
+                "shasum": ""
+            },
+            "require": {
+                "php": "~7.4.0 || ~8.0.0 || ~8.1.0 || ~8.2.0 || ~8.3.0",
+                "phpunit/phpunit": "^8.5.36 || ^9.6.0 || ^10.4.0"
+            },
+            "require-dev": {
+                "ergebnis/composer-normalize": "^2.28.3",
+                "ergebnis/data-provider": "^3.2.0",
+                "ergebnis/license": "^2.4.0",
+                "ergebnis/php-cs-fixer-config": "^6.13.0",
+                "fakerphp/faker": "^1.23.0",
+                "psalm/plugin-phpunit": "~0.18.4",
+                "rector/rector": "~0.18.11",
+                "vimeo/psalm": "^5.16.0"
+            },
+            "type": "library",
+            "extra": {
+                "composer-normalize": {
+                    "indent-size": 2,
+                    "indent-style": "space"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Ergebnis\\PHPUnit\\SlowTestDetector\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Andreas Möller",
+                    "email": "am@localheinz.com",
+                    "homepage": "https://localheinz.com"
+                }
+            ],
+            "description": "Provides facilities for detecting slow tests in phpunit/phpunit.",
+            "homepage": "https://github.com/ergebnis/phpunit-slow-test-detector",
+            "keywords": [
+                "detector",
+                "extension",
+                "phpunit",
+                "slow",
+                "test"
+            ],
+            "support": {
+                "issues": "https://github.com/ergebnis/phpunit-slow-test-detector/issues",
+                "security": "https://github.com/ergebnis/phpunit-slow-test-detector/blob/main/.github/SECURITY.md",
+                "source": "https://github.com/ergebnis/phpunit-slow-test-detector"
+            },
+            "time": "2023-12-03T12:58:50+00:00"
+        },
         {
             "name": "erickskrauch/php-cs-fixer-custom-fixers",
             "version": "1.2.1",
diff --git a/test/Unit/phpunit.xml b/test/Unit/phpunit.xml
index 8e6341e..99e7735 100644
--- a/test/Unit/phpunit.xml
+++ b/test/Unit/phpunit.xml
@@ -27,6 +27,9 @@
             <directory suffix=".php">../../src/</directory>
         </include>
     </coverage>
+    <extensions>
+        <extension class="Ergebnis\PHPUnit\SlowTestDetector\Extension"/>
+    </extensions>
     <testsuites>
         <testsuite name="Unit Tests">
             <directory>.</directory>