diff --git a/.gitignore b/.gitignore
index 57872d0..3a9875b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /vendor/
+composer.lock
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..dc863ce
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,18 @@
+language: php
+
+php:
+  - 7.2
+  - 7.3
+  - 7.4
+
+env:
+  - SYMFONY_VERSION="2.1"
+  - SYMFONY_VERSION="3.0"
+
+before_script:
+  - composer self-update
+  - composer --version
+  - composer require symfony/framework-bundle:${SYMFONY_VERSION} --no-update
+  - composer install -n --dev --prefer-source
+
+script: phpunit --configuration phpunit.xml.dist
diff --git a/composer.json b/composer.json
index b81c348..396ff9b 100644
--- a/composer.json
+++ b/composer.json
@@ -2,8 +2,8 @@
     "name": "xola/reportwriter-bundle",
     "description": "A generic report writer",
     "require": {
-        "php": ">=5.6",
-        "symfony/framework-bundle": "~2.1",
+        "php": ">=7.1",
+        "symfony/framework-bundle": ">=2.1 <4.0",
         "psr/log": "~1.0",
         "phpoffice/phpspreadsheet": "^1.3"
     },
@@ -20,6 +20,6 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.4"
+        "phpunit/phpunit": "~7"
     }
 }
diff --git a/composer.lock b/composer.lock
deleted file mode 100644
index 5dea4de..0000000
--- a/composer.lock
+++ /dev/null
@@ -1,1919 +0,0 @@
-{
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-                    "email": "kontakt@beberlei.de"
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-                    "homepage": "http://www.instaclick.com"
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diff --git a/test/phpunit.xml.dist b/phpunit.xml.dist
similarity index 71%
rename from test/phpunit.xml.dist
rename to phpunit.xml.dist
index 1a83edb..20e8039 100644
--- a/test/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -4,15 +4,14 @@
          backupStaticAttributes="false"
          convertErrorsToExceptions="true"
          convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
+         convertWarningsToExceptions="false"
          processIsolation="false"
          stopOnFailure="false"
-         syntaxCheck="false"
-         bootstrap="bootstrap.php">
+         bootstrap="test/bootstrap.php">
 
     <testsuites>
         <testsuite name="all">
-            <directory>.</directory>
+            <directory>test</directory>
         </testsuite>
     </testsuites>
 
diff --git a/src/Resources/config/services.yml b/src/Resources/config/services.yml
index 93c752a..246e7af 100644
--- a/src/Resources/config/services.yml
+++ b/src/Resources/config/services.yml
@@ -5,16 +5,16 @@ parameters:
 
 services:
     csvwriter:
-        class: %csvwriter.service.class%
-        arguments: [ @logger ]
+        class: "%csvwriter.service.class%"
+        arguments: [ "@logger" ]
         tags:
               - { name: monolog.logger, channel: csvwriter }
 
     excelwriter:
         class: %excelwriter.service.class%
-        arguments: [ @logger, @phpexcel ]
+        arguments: [ "@logger", "@phpexcel" ]
         tags:
               - { name: monolog.logger, channel: excelwriter }
 
     phpexcel:
-        class: %phpexcel.class%
+        class: "%phpexcel.class%"
diff --git a/test/Service/CSVWriterTest.php b/test/Service/CSVWriterTest.php
index 7e2d50d..4293251 100644
--- a/test/Service/CSVWriterTest.php
+++ b/test/Service/CSVWriterTest.php
@@ -1,27 +1,28 @@
 <?php
 
+use PHPUnit\Framework\TestCase;
 use Xola\ReportWriterBundle\Service\CSVWriter;
 
-class CSVWriterTest extends PHPUnit_Framework_TestCase
+class CSVWriterTest extends TestCase
 {
     /** @var CSVWriter */
     private $writer;
     private $testfilename;
 
-    public function setUp()
+    protected function setUp(): void
     {
         $this->writer = $this->buildService();
         $this->testfilename = uniqid() . ".csv";
         $this->writer->setup($this->testfilename);
     }
 
-    public function tearDown()
+    protected function tearDown(): void
     {
         $this->writer->finalize();
         unlink($this->testfilename);
     }
 
-    public function buildService($params = [])
+    private function buildService($params = [])
     {
         $defaults = ['logger' => $this->getMockBuilder('Psr\Log\LoggerInterface')->disableOriginalConstructor()->getMock()];
         $params = array_merge($defaults, $params);
diff --git a/test/Service/ExcelWriterTest.php b/test/Service/ExcelWriterTest.php
index 51c72ca..fe100ec 100644
--- a/test/Service/ExcelWriterTest.php
+++ b/test/Service/ExcelWriterTest.php
@@ -3,23 +3,24 @@
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Worksheet\PageSetup;
 use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
+use PHPUnit\Framework\TestCase;
 use Psr\Log\LoggerInterface;
 use Xola\ReportWriterBundle\Service\ExcelWriter;
 use Xola\ReportWriterBundle\SpreadsheetFactory;
 
-class ExcelWriterTest extends PHPUnit_Framework_TestCase
+class ExcelWriterTest extends TestCase
 {
-    /* @var Spreadsheet|\PHPUnit_Framework_MockObject_MockObject */
+    /* @var Spreadsheet */
     private $spreadsheet;
 
-    public function setUp()
+    protected function setUp(): void
     {
         $this->spreadsheet = $this->getMockBuilder(Spreadsheet::class)->disableOriginalConstructor()->getMock();
     }
 
     public function buildService($params = [])
     {
-        $defaults = ['logger' => $this->getMock(LoggerInterface::class)];
+        $defaults = ['logger' => $this->createMock(LoggerInterface::class)];
         if(!isset($params['phpExcel'])) {
             $defaults['phpExcel'] = $this->getSpreadsheetFactoryMock();
         }