diff --git a/composer.json b/composer.json
index 61d5b99..5769537 100644
--- a/composer.json
+++ b/composer.json
@@ -3,15 +3,13 @@
     "description": "Testing Suite For Lumen like Laravel does.",
     "keywords": ["phpunit", "test", "lumen", "testing", "laravel", "laravel"],
     "license": "MIT",
-    "authors": [
-        {
-            "name": "Albert Chen",
-            "email": "albert.cht@gmail.com"
-        }
-    ],
+    "authors": [{
+        "name": "Albert Chen",
+        "email": "albert.cht@gmail.com"
+    }],
     "require": {
         "php": "^7.1",
-        "laravel/lumen-framework": "5.3.*|5.4.*|5.5.*|5.6.*|5.7.*"
+        "laravel/lumen-framework": "5.3.*|5.4.*|5.5.*|5.6.*|5.7.*|5.8.*"
 
     },
     "require-dev": {
@@ -23,4 +21,4 @@
             "AlbertCht\\Lumen\\Testing\\": "src/"
         }
     }
-}
+}
\ No newline at end of file
diff --git a/src/TestCase.php b/src/TestCase.php
index e82cdeb..bbb050f 100644
--- a/src/TestCase.php
+++ b/src/TestCase.php
@@ -14,14 +14,14 @@ abstract class TestCase extends LumenTestCase
         Concerns\InteractsWithAuthentication,
         Concerns\MocksApplicationServices;
 
-    static protected $appPath;
+    protected static $appPath;
 
     /**
      * Setup the test environment.
      *
      * @return void
      */
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();
         $this->appendTraits();
@@ -64,4 +64,4 @@ protected function getAppPath()
 
         return static::$appPath;
     }
-}
+}
\ No newline at end of file