diff --git a/.travis.yml b/.travis.yml
index 2588c77..f780e09 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,9 +2,10 @@ language: php
 php:
   - 5.3
   - 5.4
+  - 5.5
 
 env:
-  - SYMFONY_VERSION=v2.3.3
+  - SYMFONY_VERSION=v2.8
   - SYMFONY_VERSION=origin/master
 
 before_script:
diff --git a/Form/Type/DatetimeType.php b/Form/Type/DatetimeType.php
index be802aa..bf4bdd9 100644
--- a/Form/Type/DatetimeType.php
+++ b/Form/Type/DatetimeType.php
@@ -46,7 +46,7 @@ class DatetimeType extends AbstractType
     *
     * @param array $options
     */
-    public function __construct(array $options)
+    public function __construct(array $options = array())
     {
         $this->options = $options;
 
@@ -164,7 +164,7 @@ public function getParent()
     
     public function getName()
     {
-        return 'collot_datetime';
+        return $this->getBlockPrefix();
     }
 
     public function getBlockPrefix()
diff --git a/README.md b/README.md
index 251770e..167bc6b 100644
--- a/README.md
+++ b/README.md
@@ -59,14 +59,16 @@ $ php app/console assets:install web/
 ``` php
 <?php
 // ...
+use SC\DatetimepickerBundle\Form\Type\DatetimeType;
+
 public function buildForm(FormBuilder $builder, array $options)
 {
     $builder
         // defaut options
-        ->add('createdAt', 'collot_datetime') 
+        ->add('createdAt', DatetimeType::class) 
         
         // full options
-        ->add('updatedAt', 'collot_datetime', array( 'pickerOptions' =>
+        ->add('updatedAt', DatetimeType::class, array( 'pickerOptions' =>
             array('format' => 'mm/dd/yyyy',
                 'weekStart' => 0,
                 'startDate' => date('m/d/Y'), //example
diff --git a/composer.json b/composer.json
index 75ff649..bee1939 100644
--- a/composer.json
+++ b/composer.json
@@ -11,9 +11,9 @@
         }
     ],
     "require": {
-        "php": ">=5.3",
-        "symfony/framework-bundle": "2.*",
-        "symfony/symfony": "2.*"
+        "php": ">=5.3.9",
+        "symfony/framework-bundle": "~2.8 || ~3.0",
+        "symfony/symfony": "~2.8 || ~3.0"
     },
     "autoload":     {
         "psr-0": {