diff --git a/.gitignore b/.gitignore
index 7739fcc7..55ff9b07 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .idea
 /vendor
 composer.lock
+.phpunit.result.cache
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 57c25f66..a0b5e407 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,7 @@
 language: php
 
 php:
-  - '5.6'
-  - '7.1'
+  - '7.3'
   - '7.4'
 
 sudo: false
diff --git a/composer.json b/composer.json
index 3d3678be..b7c19205 100644
--- a/composer.json
+++ b/composer.json
@@ -25,8 +25,8 @@
     },
     "require-dev": {
         "fzaninotto/faker": "~1.4",
-        "mockery/mockery": "0.9.*",
-        "phpunit/phpunit": "~5.0"
+        "mockery/mockery": ">=1.4",
+        "phpunit/phpunit": "^9"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpunit.xml b/phpunit.xml
index 9a80ef03..d154e28b 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,24 +1,16 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit backupGlobals="false"
-         backupStaticAttributes="false"
-         bootstrap="tests/bootstrap.php"
-         colors="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         processIsolation="false"
-         stopOnFailure="false">
-    <testsuites>
-        <testsuite name="Reliese Test Suite">
-            <directory suffix="Test.php">./tests</directory>
-        </testsuite>
-    </testsuites>
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">./src</directory>
-        </whitelist>
-    </filter>
-    <php>
-        <env name="APP_ENV" value="testing"/>
-    </php>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" backupGlobals="false" backupStaticAttributes="false" bootstrap="tests/bootstrap.php" colors="true" convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" processIsolation="false" stopOnFailure="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">./src</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="Reliese Test Suite">
+      <directory suffix="Test.php">./tests</directory>
+    </testsuite>
+  </testsuites>
+  <php>
+    <env name="APP_ENV" value="testing"/>
+  </php>
 </phpunit>
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 3f5921bd..a3f9e4e4 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -4,12 +4,12 @@
  * Created by Cristian.
  * Date: 16/10/16 12:49 PM.
  */
-class TestCase extends PHPUnit_Framework_TestCase
+class TestCase extends \PHPUnit\Framework\TestCase
 {
     /**
      * Clean up the testing environment before the next test.
      */
-    protected function tearDown()
+    protected function tearDown(): void
     {
         if (class_exists('Mockery')) {
             Mockery::close();