diff --git a/composer.json b/composer.json
index b25b9a0..03f289e 100644
--- a/composer.json
+++ b/composer.json
@@ -1,8 +1,6 @@
 {
-    "require-dev": {
-        "phpunit/phpunit": "^8.4"
-    },
     "require": {
-        "phpmailer/phpmailer": "^6.1"
+        "phpmailer/phpmailer": "^6.1",
+        "phpunit/phpunit": "^9.4"
     }
 }
diff --git a/tests/csvTest.php b/tests/CsvTest.php
similarity index 100%
rename from tests/csvTest.php
rename to tests/CsvTest.php
diff --git a/tests/startPageTest.php b/tests/StartPageTest.php
similarity index 100%
rename from tests/startPageTest.php
rename to tests/StartPageTest.php
diff --git a/tests/config.xml b/tests/config.xml
index db95ec0..f9e0ec1 100644
--- a/tests/config.xml
+++ b/tests/config.xml
@@ -1,43 +1,8 @@
-<phpunit
-        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/|version|/phpunit.xsd"
-        backupGlobals="false"
-        backupStaticAttributes="false"
-        beStrictAboutChangesToGlobalState="false"
-        beStrictAboutOutputDuringTests="false"
-        beStrictAboutResourceUsageDuringSmallTests="true"
-        beStrictAboutTodoAnnotatedTests="true"
-        beStrictAboutCoversAnnotation="false"
-        cacheResult="false"
-        cacheTokens="false"
-        colors="true"
-        convertErrorsToExceptions="false"
-        convertDeprecationsToExceptions="true"
-        convertNoticesToExceptions="true"
-        convertWarningsToExceptions="true"
-        enforceTimeLimit="true"
-        forceCoversAnnotation="false"
-        printerClass="PHPUnit\TextUI\ResultPrinter"
-        processIsolation="true"
-        stopOnError="true"
-        stopOnFailure="true"
-        stopOnIncomplete="true"
-        stopOnSkipped="true"
-        stopOnRisky="true"
-        testSuiteLoaderClass="PHPUnit\Runner\StandardTestSuiteLoader"
-        timeoutForSmallTests="1"
-        timeoutForMediumTests="10"
-        timeoutForLargeTests="60"
-        verbose="true">
-	<filter>
-		<whitelist processUncoveredFilesFromWhitelist="true">
-			<directory suffix=".php">../exceptions/</directory>
-			<!-- <file>/path/to/file</file>
-			<exclude>
-				<directory suffix=".php">/path/to/files</directory>
-				<file>/path/to/file</file>
-			</exclude>-->
-		</whitelist>
-	</filter>
+<?xml version="1.0"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd" backupGlobals="false" backupStaticAttributes="false" beStrictAboutChangesToGlobalState="false" beStrictAboutOutputDuringTests="false" beStrictAboutResourceUsageDuringSmallTests="true" beStrictAboutTodoAnnotatedTests="true" beStrictAboutCoversAnnotation="false" cacheResult="false" colors="true" convertErrorsToExceptions="false" convertDeprecationsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" enforceTimeLimit="true" forceCoversAnnotation="false" processIsolation="true" stopOnError="true" stopOnFailure="true" stopOnIncomplete="true" stopOnSkipped="true" stopOnRisky="true" testSuiteLoaderClass="PHPUnit\Runner\StandardTestSuiteLoader" timeoutForSmallTests="1" timeoutForMediumTests="10" timeoutForLargeTests="60" verbose="true">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">../exceptions/</directory>
+    </include>
+  </coverage>
 </phpunit>
-