diff --git a/.travis.yml b/.travis.yml
index 0382f95c..b53fc4ec 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,22 +1,21 @@
 language: php
+os:
+  - linux
+dist: bionic
 
 php:
-  - 5.6
-  - 7.0
-  - 7.1
-  - 7.2
-  - 7.3
   - 7.4
+  - 8.0
+  - 8.1.0
 
 env:
-  - SYMFONY_VERSION=2.7.*
-  - SYMFONY_VERSION=2.8.*
-  - SYMFONY_VERSION=3.4.*
+  - SYMFONY_VERSION=5.4.*
+  - SYMFONY_VERSION=6.0.*
 
-matrix:
-  allow_failures:
-    - php: 5.6
-    - php: 7.1
+jobs:
+  exclude:
+    - php: 7.4
+      env: SYMFONY_VERSION=6.0.*
 
 before_script:
   - phpenv config-add myphp.ini
@@ -27,7 +26,7 @@ before_script:
   - ./src/BeSimple/SoapClient/Tests/bin/axis.sh
 
 script:
-  - bin/simple-phpunit --coverage-text --debug
+  - SYMFONY_DEPRECATIONS_HELPER="max[indirect]=6" bin/simple-phpunit --coverage-text
 
 notifications:
   email:
diff --git a/composer.json b/composer.json
index 4d81ed1a..2f8691c3 100644
--- a/composer.json
+++ b/composer.json
@@ -20,15 +20,15 @@
         }
     ],
     "require": {
-        "php": ">=5.4.0",
+        "php": ">=7.4.0",
         "ext-soap": "*",
         "ext-curl": "*",
         "ass/xmlsecurity": "~1.0",
-        "symfony/framework-bundle": "~2.6 || ~3.4",
-        "symfony/twig-bundle": "~2.6 || ~3.4",
-        "zendframework/zend-mime": "2.*",
-        "zendframework/zend-serializer": "^2.9",
-        "zendframework/zend-servicemanager": "^3.3"
+        "symfony/error-handler": "^5.4.3 || ^6.0.3",
+        "symfony/framework-bundle": "^5.4.4 || ^6.0.4",
+        "laminas/laminas-mail": "2.*",
+        "laminas/laminas-mime": "2.*",
+        "laminas/laminas-serializer": "^2.12"
     },
     "replace": {
         "besimple/soap-bundle": "self.version",
@@ -39,8 +39,8 @@
     },
     "require-dev": {
         "mikey179/vfsstream": "~1.0",
-        "symfony/filesystem": "~2.3",
-        "symfony/process": "~2.3",
+        "symfony/filesystem": "^5.4.3 || ^6.0.3",
+        "symfony/process": "^5.4.3 || ^6.0.3",
         "symfony/phpunit-bridge": "*"
     },
     "autoload": {
@@ -54,4 +54,4 @@
     "config": {
         "bin-dir": "bin"
     }
-}
\ No newline at end of file
+}
diff --git a/src/BeSimple/SoapBundle/Soap/SoapRequest.php b/src/BeSimple/SoapBundle/Soap/SoapRequest.php
index 346f6924..fec8f731 100644
--- a/src/BeSimple/SoapBundle/Soap/SoapRequest.php
+++ b/src/BeSimple/SoapBundle/Soap/SoapRequest.php
@@ -11,8 +11,8 @@
 namespace BeSimple\SoapBundle\Soap;
 
 use BeSimple\SoapBundle\Util\Collection;
+use Laminas\Mime\Message;
 use Symfony\Component\HttpFoundation\Request;
-use Zend\Mime\Message;
 
 /**
  * SoapRequest.
diff --git a/src/BeSimple/SoapBundle/Tests/Soap/SoapRequestTest.php b/src/BeSimple/SoapBundle/Tests/Soap/SoapRequestTest.php
index 68ba58a9..80e113e1 100644
--- a/src/BeSimple/SoapBundle/Tests/Soap/SoapRequestTest.php
+++ b/src/BeSimple/SoapBundle/Tests/Soap/SoapRequestTest.php
@@ -23,8 +23,6 @@ class SoapRequestTest extends \PHPUnit\Framework\TestCase
 {
     public function testMtomMessage()
     {
-        $this->markTestSkipped('Skip because I\'m not sure that SoapRequest is used in a HTTP Request process.');
-
         $content = $this->loadRequestContentFixture('mtom/simple.txt');
 
         $request = new SoapRequest(array(), array(), array(), array(), array(), array(), $content);
diff --git a/src/BeSimple/SoapBundle/Util/Collection.php b/src/BeSimple/SoapBundle/Util/Collection.php
index 4ea56994..edd1c584 100644
--- a/src/BeSimple/SoapBundle/Util/Collection.php
+++ b/src/BeSimple/SoapBundle/Util/Collection.php
@@ -53,12 +53,12 @@ public function clear()
         $this->elements = array();
     }
 
-    public function count()
+    public function count(): int
     {
         return count($this->elements);
     }
 
-    public function getIterator()
+    public function getIterator(): \Traversable
     {
         return new \ArrayIterator($this->elements);
     }
diff --git a/src/BeSimple/SoapBundle/WebServiceContext.php b/src/BeSimple/SoapBundle/WebServiceContext.php
index dd20ef85..4be995e2 100644
--- a/src/BeSimple/SoapBundle/WebServiceContext.php
+++ b/src/BeSimple/SoapBundle/WebServiceContext.php
@@ -15,9 +15,9 @@
 use BeSimple\SoapCommon\Converter\TypeConverterCollection;
 use BeSimple\SoapWsdl\Dumper\Dumper;
 use BeSimple\SoapServer\SoapServerBuilder;
+use Laminas\Serializer\Serializer;
 use Symfony\Component\Config\ConfigCache;
 use Symfony\Component\Config\Loader\LoaderInterface;
-use Zend\Serializer\Serializer;
 
 /**
  * WebServiceContext.
diff --git a/src/BeSimple/SoapClient/SoapClient.php b/src/BeSimple/SoapClient/SoapClient.php
index 5dcf8299..8e306aee 100644
--- a/src/BeSimple/SoapClient/SoapClient.php
+++ b/src/BeSimple/SoapClient/SoapClient.php
@@ -238,7 +238,7 @@ protected function __doHttpRequest(SoapRequest $soapRequest)
      *
      * @return string
      */
-    public function __doRequest($request, $location, $action, $version, $oneWay = 0)
+    public function __doRequest($request, $location, $action, $version, $oneWay = 0): ?string
     {
         // wrap request data in SoapRequest object
         $soapRequest = SoapRequest::create($request, $location, $action, $version);
@@ -307,7 +307,7 @@ protected function filterRequestOptions(SoapRequest $soapRequest)
      *
      * @return string
      */
-    public function __getLastRequestHeaders()
+    public function __getLastRequestHeaders(): ?string
     {
         return $this->lastRequestHeaders;
     }
@@ -327,7 +327,7 @@ public function __getRequestHeaders()
      *
      * @return string
      */
-    public function __getLastRequest()
+    public function __getLastRequest(): ?string
     {
         return $this->lastRequest;
     }
@@ -347,7 +347,7 @@ public function __getLastRequestUri()
      *
      * @return string
      */
-    public function __getLastResponseHeaders()
+    public function __getLastResponseHeaders(): ?string
     {
         return $this->lastResponseHeaders;
     }
@@ -357,7 +357,7 @@ public function __getLastResponseHeaders()
      *
      * @return string
      */
-    public function __getLastResponse()
+    public function __getLastResponse(): ?string
     {
         return $this->lastResponse;
     }
diff --git a/src/BeSimple/SoapClient/Tests/AbstractWebserverTest.php b/src/BeSimple/SoapClient/Tests/AbstractWebserverTest.php
index 30c94bfb..5479109c 100644
--- a/src/BeSimple/SoapClient/Tests/AbstractWebserverTest.php
+++ b/src/BeSimple/SoapClient/Tests/AbstractWebserverTest.php
@@ -13,46 +13,37 @@
 namespace BeSimple\SoapClient\Tests;
 
 use Symfony\Component\Process\PhpExecutableFinder;
-use Symfony\Component\Process\ProcessBuilder;
+use Symfony\Component\Process\Process;
 
 /**
  * @author francis.besset@gmail.com <francis.besset@gmail.com>
  */
 abstract class AbstractWebServerTest extends \PHPUnit\Framework\TestCase
 {
-    // when using the SetUpTearDownTrait, methods like doSetup() can
-    // be defined with and without the 'void' return type, as you wish
-    use \Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
-
     /**
      * @var ProcessBuilder
      */
     static protected $webserver;
-    static protected $websererPortLength;
+    static protected $webserverPortLength;
 
-    public static function doSetUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
-        if (version_compare(PHP_VERSION, '5.4.0', '<')) {
-            self::markTestSkipped('PHP Webserver is available from PHP 5.4');
-        }
-
         $phpFinder = new PhpExecutableFinder();
-        self::$webserver = ProcessBuilder::create(array(
-            'exec', // used exec binary (https://github.com/symfony/symfony/issues/5759)
+        self::$webserver = new Process(array(
             $phpFinder->find(),
             '-S',
             sprintf('localhost:%d', WEBSERVER_PORT),
             '-t',
             __DIR__.DIRECTORY_SEPARATOR.'Fixtures',
-        ))->getProcess();
+        ));
 
         self::$webserver->start();
         usleep(200000);
 
-        self::$websererPortLength = strlen(WEBSERVER_PORT);
+        self::$webserverPortLength = strlen(WEBSERVER_PORT);
     }
 
-    public static function doTearDownAfterClass()
+    public static function tearDownAfterClass(): void
     {
         self::$webserver->stop(0);
         usleep(100000);
diff --git a/src/BeSimple/SoapClient/Tests/AxisInterop/TestCase.php b/src/BeSimple/SoapClient/Tests/AxisInterop/TestCase.php
index 46d90e89..fb5e4b28 100644
--- a/src/BeSimple/SoapClient/Tests/AxisInterop/TestCase.php
+++ b/src/BeSimple/SoapClient/Tests/AxisInterop/TestCase.php
@@ -4,11 +4,7 @@
 
 class TestCase extends \PHPUnit\Framework\TestCase
 {
-    // when using the SetUpTearDownTrait, methods like doSetup() can
-    // be defined with and without the 'void' return type, as you wish
-    use \Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
-
-    protected function doSetUp()
+    protected function setUp(): void
     {
         $ch = curl_init('http://localhost:8080/');
         curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
diff --git a/src/BeSimple/SoapClient/Tests/CurlTest.php b/src/BeSimple/SoapClient/Tests/CurlTest.php
index 0abf50e3..1f63650c 100644
--- a/src/BeSimple/SoapClient/Tests/CurlTest.php
+++ b/src/BeSimple/SoapClient/Tests/CurlTest.php
@@ -37,13 +37,13 @@ public function testGetErrorMessage()
         ));
 
         $curl->exec('http://unknown/curl.txt');
-        $this->assertRegExp('/^Could not connect to host.*$/', $curl->getErrorMessage());
+        $this->assertMatchesRegularExpression('/^Could not connect to host.*$/', $curl->getErrorMessage());
 
         $curl->exec(sprintf('xyz://localhost:%d/@404.txt', WEBSERVER_PORT));
-        $this->assertRegExp('/^Unknown protocol. Only http and https are allowed.*$/', $curl->getErrorMessage());
+        $this->assertMatchesRegularExpression('/^Unknown protocol. Only http and https are allowed.*$/', $curl->getErrorMessage());
 
         $curl->exec('');
-        $this->assertRegExp('/^Unable to parse URL.*$/', $curl->getErrorMessage());
+        $this->assertMatchesRegularExpression('/^Unable to parse URL.*$/', $curl->getErrorMessage());
     }
 
     public function testGetRequestHeaders()
@@ -53,10 +53,10 @@ public function testGetRequestHeaders()
         ));
 
         $curl->exec(sprintf('http://localhost:%d/curl.txt', WEBSERVER_PORT));
-        $this->assertEquals(132 + self::$websererPortLength, strlen($curl->getRequestHeaders()));
+        $this->assertCorrectRequestHeaders($curl->getRequestHeaders(), '/curl.txt');
 
         $curl->exec(sprintf('http://localhost:%s/404.txt', WEBSERVER_PORT));
-        $this->assertEquals(131 + self::$websererPortLength, strlen($curl->getRequestHeaders()));
+        $this->assertCorrectRequestHeaders($curl->getRequestHeaders(), '/404.txt');
     }
 
     public function testGetResponse()
@@ -67,10 +67,11 @@ public function testGetResponse()
 
         $curl->exec(sprintf('http://localhost:%d/curl.txt', WEBSERVER_PORT));
         $this->assertSame('OK', $curl->getResponseStatusMessage());
-        // Adjust for PHP >= 7.2 sending a Date header
+
         $response = $curl->getResponse();
-        $response = preg_replace('/^Date:.*?\r\n/m', '', $response);
-        $this->assertEquals(145 + self::$websererPortLength, strlen($response));
+        [$headers, $body] = explode("\r\n\r\n", $response, 2);
+        $this->assertCorrectResponseHeaders($headers, '200 OK', 'text/plain', strlen($body));
+        $this->assertSame('This is a testfile for cURL.', $body);
 
         $curl->exec(sprintf('http://localhost:%d/404.txt', WEBSERVER_PORT));
         $this->assertSame('Not Found', $curl->getResponseStatusMessage());
@@ -106,16 +107,12 @@ public function testGetResponseHeaders()
         ));
 
         $curl->exec(sprintf('http://localhost:%d/curl.txt', WEBSERVER_PORT));
-        // Adjust for PHP >= 7.2 sending a Date header
         $headers = $curl->getResponseHeaders();
-        $headers = preg_replace('/^Date:.*?\r\n/m', '', $headers);
-        $this->assertEquals(117 + self::$websererPortLength, strlen($headers));
+        $this->assertCorrectResponseHeaders($headers, '200 OK', 'text/plain');
 
         $curl->exec(sprintf('http://localhost:%d/404.txt', WEBSERVER_PORT));
-        // Adjust for PHP >= 7.2 sending a Date header
         $headers = $curl->getResponseHeaders();
-        $headers = preg_replace('/^Date:.*?\r\n/m', '', $headers);
-        $this->assertEquals(124 + self::$websererPortLength, strlen($headers));
+        $this->assertCorrectResponseHeaders($headers, '404 Not Found', 'text/html');
     }
 
     public function testGetResponseStatusCode()
@@ -130,4 +127,22 @@ public function testGetResponseStatusCode()
         $curl->exec(sprintf('http://localhost:%d/404.txt', WEBSERVER_PORT));
         $this->assertEquals(404, $curl->getResponseStatusCode());
     }
+
+    protected function assertCorrectRequestHeaders($headerStr, $requestPath)
+    {
+        $headers = explode("\r\n", $headerStr);
+        $this->assertContains("GET $requestPath HTTP/1.1", $headers);
+        $this->assertContains('User-Agent: PHP-SOAP/\BeSimple\SoapClient', $headers);
+        $this->assertContains('Accept: */*', $headers);
+    }
+
+    protected function assertCorrectResponseHeaders($headerStr, $status, $contentType, $contentLen = null)
+    {
+        $headers = explode("\r\n", $headerStr);
+        $this->assertContains("HTTP/1.1 $status", $headers);
+        $this->assertContains("Content-Type: $contentType; charset=UTF-8", $headers);
+        if (null !== $contentLen) {
+            $this->assertContains("Content-Length: $contentLen", $headers);
+        }
+    }
 }
diff --git a/src/BeSimple/SoapClient/Tests/ServerInterop/TestCase.php b/src/BeSimple/SoapClient/Tests/ServerInterop/TestCase.php
index caf999a4..9b46d9a9 100644
--- a/src/BeSimple/SoapClient/Tests/ServerInterop/TestCase.php
+++ b/src/BeSimple/SoapClient/Tests/ServerInterop/TestCase.php
@@ -4,18 +4,8 @@
 
 class TestCase extends \PHPUnit\Framework\TestCase
 {
-    // when using the SetUpTearDownTrait, methods like doSetup() can
-    // be defined with and without the 'void' return type, as you wish
-    use \Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
-
-    protected function doSetUp()
+    protected function setUp(): void
     {
-        if (version_compare(PHP_VERSION, '5.3.0', '=')) {
-            $this->markTestSkipped(
-                'The PHP cli webserver is not available with PHP 5.3.'
-            );
-        }
-
         $ch = curl_init('http://localhost:8081/');
         curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
         curl_setopt($ch, CURLOPT_HEADER, true);
diff --git a/src/BeSimple/SoapClient/Tests/SoapClientTest.php b/src/BeSimple/SoapClient/Tests/SoapClientTest.php
index d379b9ce..bceb95bd 100644
--- a/src/BeSimple/SoapClient/Tests/SoapClientTest.php
+++ b/src/BeSimple/SoapClient/Tests/SoapClientTest.php
@@ -50,7 +50,7 @@ public function testSoapFaultWhenPassingInvalidWSDLs($wsdl)
         }
 
         $this->assertInstanceOf('SoapFault', $soapFault, 'Invalid type of exception');
-        $this->assertRegExp('/SOAP-ERROR: Parsing WSDL: .*/', $soapFault->getMessage(), 'Invalid or incorrect exception message');
+        $this->assertMatchesRegularExpression('/SOAP-ERROR: Parsing WSDL: .*/', $soapFault->getMessage(), 'Invalid or incorrect exception message');
         $this->assertStringContainsString('WSDL', $soapFault->faultcode, 'Invalid type of faultcode');
     }
 
diff --git a/src/BeSimple/SoapClient/Tests/WsdlDownloaderTest.php b/src/BeSimple/SoapClient/Tests/WsdlDownloaderTest.php
index e53acea4..4e6b221b 100644
--- a/src/BeSimple/SoapClient/Tests/WsdlDownloaderTest.php
+++ b/src/BeSimple/SoapClient/Tests/WsdlDownloaderTest.php
@@ -25,10 +25,6 @@
  */
 class WsdlDownloaderTest extends AbstractWebserverTest
 {
-    // when using the SetUpTearDownTrait, methods like doSetup() can
-    // be defined with and without the 'void' return type, as you wish
-    use \Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
-
     protected static $filesystem;
 
     protected static $fixturesPath;
@@ -57,7 +53,7 @@ public function testDownloadDownloadsToVfs($source, $regexp, $nbDownloads)
 
         //Test that the Cache filename is valid
         $regexp = '#'.sprintf($regexp, $cacheDirForRegExp).'#';
-        $this->assertRegExp($regexp, $cacheFileName);
+        $this->assertMatchesRegularExpression($regexp, $cacheFileName);
 
     }
 
@@ -137,7 +133,7 @@ public function testResolveWsdlIncludes($source, $cacheFile, $remoteParentUrl, $
         $m->invoke($wsdlDownloader, file_get_contents($source), $cacheFile, $remoteParentUrl);
         $this->assertCount($nbDownloads, $wsdlCacheDir->getChildren());
 
-        $this->assertRegExp('#'.sprintf($regexp, $cacheDirForRegExp).'#', file_get_contents($cacheFile));
+        $this->assertMatchesRegularExpression('#'.sprintf($regexp, $cacheDirForRegExp).'#', file_get_contents($cacheFile));
     }
 
     public function provideResolveWsdlIncludes()
@@ -204,7 +200,7 @@ public function testResolveXsdIncludes($source, $cacheFile, $remoteParentUrl, $r
         $m->invoke($wsdlDownloader, file_get_contents($source), $cacheFile, $remoteParentUrl);
         $this->assertCount($nbDownloads, $wsdlCacheDir->getChildren());
 
-        $this->assertRegExp('#'.sprintf($regexp, $cacheDirForRegExp).'#', file_get_contents($cacheFile));
+        $this->assertMatchesRegularExpression('#'.sprintf($regexp, $cacheDirForRegExp).'#', file_get_contents($cacheFile));
     }
 
     public function provideResolveXsdIncludes()
@@ -330,10 +326,10 @@ public function testValidResponseCode()
 
         $result = $wsdlDownloader->download('http://somefake.url/wsdl');
 
-        $this->assertRegExp('/.*wsdl_[a-f0-9]{32}\.cache/', $result);
+        $this->assertMatchesRegularExpression('/.*wsdl_[a-f0-9]{32}\.cache/', $result);
     }
 
-    public static function doSetUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         parent::setUpBeforeClass();
 
@@ -349,7 +345,7 @@ public static function doSetUpBeforeClass()
         }
     }
 
-    public static function doTearDownAfterClass()
+    public static function tearDownAfterClass(): void
     {
         parent::tearDownAfterClass();
 
diff --git a/src/BeSimple/SoapCommon/FilterHelper.php b/src/BeSimple/SoapCommon/FilterHelper.php
index 01a17177..2c7aeabf 100644
--- a/src/BeSimple/SoapCommon/FilterHelper.php
+++ b/src/BeSimple/SoapCommon/FilterHelper.php
@@ -134,7 +134,7 @@ public function addNamespace($prefix, $namespaceURI)
      *
      * @return \DOMElement
      */
-    public function createElement($namespaceURI, $name, $value = null)
+    public function createElement($namespaceURI, $name, $value = '')
     {
         $prefix = $this->namespaces[$namespaceURI];
 
diff --git a/src/BeSimple/SoapCommon/Mime/PartHeader.php b/src/BeSimple/SoapCommon/Mime/PartHeader.php
index 958c85fd..da7c2d3e 100644
--- a/src/BeSimple/SoapCommon/Mime/PartHeader.php
+++ b/src/BeSimple/SoapCommon/Mime/PartHeader.php
@@ -86,7 +86,7 @@ public function getHeader($name, $subValue = null)
      */
     protected function generateHeaders()
     {
-        $charset = strtolower($this->getHeader('Content-Type', 'charset'));
+        $charset = strtolower($this->getHeader('Content-Type', 'charset') ?? '');
         $preferences = array(
             'scheme' => 'Q',
             'input-charset' => 'utf-8',
diff --git a/src/BeSimple/SoapCommon/Tests/CacheTest.php b/src/BeSimple/SoapCommon/Tests/CacheTest.php
index 14a9cf96..7bb30340 100644
--- a/src/BeSimple/SoapCommon/Tests/CacheTest.php
+++ b/src/BeSimple/SoapCommon/Tests/CacheTest.php
@@ -18,10 +18,6 @@
 
 class SoapRequestTest extends \PHPUnit\Framework\TestCase
 {
-    // when using the SetUpTearDownTrait, methods like doSetup() can
-    // be defined with and without the 'void' return type, as you wish
-    use \Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
-
     public function testSetEnabled()
     {
         Cache::setEnabled(Cache::ENABLED);
@@ -87,7 +83,7 @@ public function testSetLimit()
         $this->assertEquals(1, Cache::getLimit());
     }
 
-    public function doSetUp()
+    public function setUp(): void
     {
         ini_restore('soap.wsdl_cache_enabled');
         ini_restore('soap.wsdl_cache');
diff --git a/src/BeSimple/SoapCommon/Tests/Mime/MultiPartTest.php b/src/BeSimple/SoapCommon/Tests/Mime/MultiPartTest.php
index 96cd3665..d0358f1c 100644
--- a/src/BeSimple/SoapCommon/Tests/Mime/MultiPartTest.php
+++ b/src/BeSimple/SoapCommon/Tests/Mime/MultiPartTest.php
@@ -26,7 +26,7 @@ public function testConstructor()
         $this->assertEquals('multipart/related', $mp->getHeader('Content-Type'));
         $this->assertEquals('text/xml', $mp->getHeader('Content-Type', 'type'));
         $this->assertEquals('utf-8', $mp->getHeader('Content-Type', 'charset'));
-        $this->assertRegExp('~urn:uuid:.*~', $mp->getHeader('Content-Type', 'boundary'));
+        $this->assertMatchesRegularExpression('~urn:uuid:.*~', $mp->getHeader('Content-Type', 'boundary'));
     }
 
     public function testGetMimeMessage()
diff --git a/src/BeSimple/SoapCommon/Tests/Mime/PartTest.php b/src/BeSimple/SoapCommon/Tests/Mime/PartTest.php
index ab6a8a43..b2ceddda 100644
--- a/src/BeSimple/SoapCommon/Tests/Mime/PartTest.php
+++ b/src/BeSimple/SoapCommon/Tests/Mime/PartTest.php
@@ -36,7 +36,7 @@ public function testDefaultConstructor()
         $this->assertEquals('application/octet-stream', $p->getHeader('Content-Type'));
         $this->assertEquals('utf-8', $p->getHeader('Content-Type', 'charset'));
         $this->assertEquals(Part::ENCODING_BINARY, $p->getHeader('Content-Transfer-Encoding'));
-        $this->assertRegExp('~<urn:uuid:.*>~', $p->getHeader('Content-ID'));
+        $this->assertMatchesRegularExpression('~<urn:uuid:.*>~', $p->getHeader('Content-ID'));
     }
 
     public function testSetContent()
diff --git a/src/BeSimple/SoapServer/SoapServer.php b/src/BeSimple/SoapServer/SoapServer.php
index dc94d5b0..0b68917d 100644
--- a/src/BeSimple/SoapServer/SoapServer.php
+++ b/src/BeSimple/SoapServer/SoapServer.php
@@ -64,7 +64,7 @@ public function __construct($wsdl, array $options = array())
      *
      * @param string $request Request string
      */
-    public function handle($request = null)
+    public function handle($request = null): void
     {
         // wrap request data in SoapRequest object
         $soapRequest = SoapRequest::create($request, $this->soapVersion);