diff --git a/.phpunit.result.cache b/.phpunit.result.cache
deleted file mode 100644
index 5deaa32..0000000
--- a/.phpunit.result.cache
+++ /dev/null
@@ -1 +0,0 @@
-C:37:"PHPUnit\Runner\DefaultTestResultCache":3429:{a:2:{s:7:"defects";a:0:{}s:5:"times";a:70:{s:38:"BootManagerTest::testBootManagerRoutes";d:0.007;s:43:"BootManagerTest::testFindUrlFromBootManager";d:0;s:38:"ClassLoaderTest::testCustomClassLoader";d:0;s:39:"EventHandlerTest::testAllEventTriggered";d:0.002;s:30:"EventHandlerTest::testAllEvent";d:0;s:33:"EventHandlerTest::testPrefixEvent";d:0;s:24:"GroupTest::testGroupLoad";d:0;s:26:"GroupTest::testNestedGroup";d:0;s:29:"GroupTest::testMultipleRoutes";d:0;s:19:"GroupTest::testUrls";d:0;s:26:"InputHandlerTest::testPost";d:0.001;s:25:"InputHandlerTest::testGet";d:0;s:26:"InputHandlerTest::testFile";d:0;s:27:"InputHandlerTest::testFiles";d:0;s:25:"InputHandlerTest::testAll";d:0;s:35:"MiddlewareTest::testMiddlewareFound";d:0.001;s:44:"MiddlewareTest::testNestedMiddlewareDontLoad";d:0;s:64:"RouterCallbackExceptionHandlerTest::testCallbackExceptionHandler";d:0;s:29:"RouterControllerTest::testGet";d:0.001;s:30:"RouterControllerTest::testPost";d:0;s:29:"RouterControllerTest::testPut";d:0;s:38:"RouterPartialGroupTest::testParameters";d:0;s:49:"RouterPartialGroupTest::testPartialGroupWithGroup";d:0.001;s:37:"RouterResourceTest::testResourceStore";d:0.001;s:38:"RouterResourceTest::testResourceCreate";d:0;s:37:"RouterResourceTest::testResourceIndex";d:0;s:39:"RouterResourceTest::testResourceDestroy";d:0;s:36:"RouterResourceTest::testResourceEdit";d:0;s:38:"RouterResourceTest::testResourceUpdate";d:0;s:35:"RouterResourceTest::testResourceGet";d:0;s:45:"RouteRewriteTest::testExceptionHandlerRewrite";d:0;s:45:"RouteRewriteTest::testRewriteExceptionMessage";d:0;s:41:"RouteRewriteTest::testRewriteUrlFromRoute";d:0;s:46:"RouteRewriteTest::testRewriteCallbackFromRoute";d:0;s:43:"RouteRewriteTest::testRewriteRouteFromRoute";d:0;s:39:"RouteRewriteTest::testMiddlewareRewrite";d:0;s:43:"RouterRouteTest::testOptionalCharacterRoute";d:0;s:31:"RouterRouteTest::testMultiParam";d:0;s:29:"RouterRouteTest::testNotFound";d:0;s:24:"RouterRouteTest::testGet";d:0;s:25:"RouterRouteTest::testPost";d:0;s:24:"RouterRouteTest::testPut";d:0;s:27:"RouterRouteTest::testDelete";d:0;s:37:"RouterRouteTest::testMethodNotAllowed";d:0;s:32:"RouterRouteTest::testSimpleParam";d:0;s:35:"RouterRouteTest::testPathParamRegex";d:0;s:39:"RouterRouteTest::testDomainAllowedRoute";d:0;s:42:"RouterRouteTest::testDomainNotAllowedRoute";d:0;s:26:"RouterRouteTest::testRegEx";d:0;s:41:"RouterRouteTest::testParametersWithDashes";d:0;s:42:"RouterRouteTest::testParameterDefaultValue";d:0;s:42:"RouterRouteTest::testDefaultParameterRegex";d:0;s:47:"RouterRouteTest::testDefaultParameterRegexGroup";d:0;s:30:"RouterRouteTest::testClassHint";d:0;s:31:"RouterRouteTest::testSameRoutes";d:0;s:27:"RouterUrlTest::testIssue253";d:0;s:36:"RouterUrlTest::testUnicodeCharacters";d:0;s:37:"RouterUrlTest::testOptionalParameters";d:0.001;s:30:"RouterUrlTest::testSimilarUrls";d:0;s:23:"RouterUrlTest::testUrls";d:0.001;s:30:"RouterUrlTest::testCustomRegex";d:0;s:47:"RouterUrlTest::testRenderMultipleRoutesDisabled";d:0;s:46:"RouterUrlTest::testRenderMultipleRoutesEnabled";d:0;s:35:"RouterUrlTest::testDefaultNamespace";d:0;s:46:"RouterRewriteTest::testExceptionHandlerRewrite";d:0;s:46:"RouterRewriteTest::testRewriteExceptionMessage";d:0;s:42:"RouterRewriteTest::testRewriteUrlFromRoute";d:0;s:47:"RouterRewriteTest::testRewriteCallbackFromRoute";d:0;s:44:"RouterRewriteTest::testRewriteRouteFromRoute";d:0;s:40:"RouterRewriteTest::testMiddlewareRewrite";d:0;}}}
\ No newline at end of file
diff --git a/composer.json b/composer.json
index a3f0b54..8514aee 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
     "ext-json": "*"
   },
   "require-dev": {
-    "phpunit/phpunit": "^9.0",
+    "phpunit/phpunit": "^6.0",
     "mockery/mockery": "^1"
   },
   "autoload": {
diff --git a/phpunit.xml b/phpunit.xml
index 8aa0a67..6e8f0c6 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -9,10 +9,16 @@
         convertNoticesToExceptions="true"
         convertWarningsToExceptions="true"
         processIsolation="false"
-        stopOnFailure="false">
+        stopOnFailure="false"
+        syntaxCheck="false">
     <testsuites>
         <testsuite name="SimpleRouter Test Suite">
             <directory>tests/Pecee/SimpleRouter/</directory>
         </testsuite>
     </testsuites>
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">src</directory>
+        </whitelist>
+    </filter>
 </phpunit>