diff --git a/.travis.yml b/.travis.yml
index 6496822..1b1092b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,8 @@ php:
   - 5.5
   - 5.6
   - 7.0
+  - 7.2
+  - 7.3
 
 matrix:
   include:
@@ -17,8 +19,8 @@ matrix:
 
 before_script:
   - echo "xdebug.max_nesting_level=1000" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
-  - if [[ $TRAVIS_PHP_VERSION = '5.6' ]]; then PHPUNIT_FLAGS="--coverage-clover=coverage.clover"; else PHPUNIT_FLAGS=""; fi
-  - if [[ $TRAVIS_PHP_VERSION != '5.6' ]]; then phpenv config-rm xdebug.ini; fi  
+  - if [[ $TRAVIS_PHP_VERSION = '7.2' ]]; then PHPUNIT_FLAGS="--coverage-clover=coverage.clover"; else PHPUNIT_FLAGS=""; fi
+  - if [[ $TRAVIS_PHP_VERSION != '7.2' ]]; then phpenv config-rm xdebug.ini; fi
   - composer self-update
   - composer update $COMPOSER_FLAGS
 
@@ -28,5 +30,5 @@ script:
 
 after_script:
   - wget https://scrutinizer-ci.com/ocular.phar
-  - if [[ $TRAVIS_PHP_VERSION = '5.6' ]] ; then php ocular.phar code-coverage:upload --format=php-clover coverage.clover; fi
+  - if [[ $TRAVIS_PHP_VERSION = '7.2' ]] ; then php ocular.phar code-coverage:upload --format=php-clover coverage.clover; fi
   
diff --git a/composer.json b/composer.json
index 438dedf..89e61b1 100644
--- a/composer.json
+++ b/composer.json
@@ -11,13 +11,13 @@
     "goetas-webservices/soap-reader": "^0.3.1",
     "goetas-webservices/wsdl-reader": "^0.3",
     "goetas-webservices/xsd2php": "^0.2.3|^0.3.0",
-    "symfony/dependency-injection": "^2.2|^3.0",
-    "symfony/config": "^2.2|^3.0",
-    "symfony/yaml": "^2.1|^3.0"
+    "symfony/dependency-injection": "^2.2|^3.0|^4.0",
+    "symfony/config": "^2.2|^3.0|^4.0",
+    "symfony/yaml": "^2.1|^3.0|^4.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^4.8|^5.0",
-    "jms/serializer": "^1.2",
+    "jms/serializer": "^1.2|^2.0|^3.0",
     "goetas-webservices/xsd2php-runtime": "^0.2.2"
   },
   "autoload": {
diff --git a/src/Resources/config/services.xml b/src/Resources/config/services.xml
index 765a575..2531324 100644
--- a/src/Resources/config/services.xml
+++ b/src/Resources/config/services.xml
@@ -10,17 +10,17 @@
             </call>
         </service>
 
-        <service id="goetas_webservices.wsdl2php.soap_reader" class="GoetasWebservices\XML\SOAPReader\SoapReader"/>
+        <service id="goetas_webservices.wsdl2php.soap_reader" class="GoetasWebservices\XML\SOAPReader\SoapReader"  public="true"/>
 
-        <service id="goetas_webservices.wsdl2php.wsdl_reader" class="GoetasWebservices\XML\WSDLReader\DefinitionsReader">
+        <service id="goetas_webservices.wsdl2php.wsdl_reader" class="GoetasWebservices\XML\WSDLReader\DefinitionsReader" public="true">
             <argument id="goetas_webservices.xsd2php.schema_reader" type="service"/>
             <argument id="goetas_webservices.wsdl2php.event_dispatcher" type="service"/>
         </service>
 
-        <service id="goetas_webservices.wsdl2php.converter.php" class="GoetasWebservices\WsdlToPhp\Generation\PhpSoapConverter">
+        <service id="goetas_webservices.wsdl2php.converter.php" class="GoetasWebservices\WsdlToPhp\Generation\PhpSoapConverter"  public="true">
             <argument id="goetas_webservices.xsd2php.converter.php" type="service"/>
         </service>
-        <service id="goetas_webservices.wsdl2php.converter.jms" class="GoetasWebservices\WsdlToPhp\Generation\JmsSoapConverter">
+        <service id="goetas_webservices.wsdl2php.converter.jms" class="GoetasWebservices\WsdlToPhp\Generation\JmsSoapConverter"  public="true">
             <argument id="goetas_webservices.xsd2php.converter.jms" type="service"/>
         </service>