diff --git a/DataTransformer/EntityToIdTransformer.php b/DataTransformer/EntityToIdTransformer.php
index c255cb6..e0b3e99 100755
--- a/DataTransformer/EntityToIdTransformer.php
+++ b/DataTransformer/EntityToIdTransformer.php
@@ -2,6 +2,7 @@
 
 namespace Gregwar\FormBundle\DataTransformer;
 
+use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Component\Form\DataTransformerInterface;
 use Symfony\Component\Form\Exception\FormException;
 use Symfony\Component\Form\Exception\TransformationFailedException;
@@ -29,7 +30,7 @@ class EntityToIdTransformer implements DataTransformerInterface
 
     private $unitOfWork;
 
-    public function __construct(EntityManager $em, $class, $property, $queryBuilder, $multiple)
+    public function __construct(EntityManagerInterface $em, $class, $property, $queryBuilder, $multiple)
     {
         if (!(null === $queryBuilder || $queryBuilder instanceof QueryBuilder || $queryBuilder instanceof \Closure)) {
             throw new UnexpectedTypeException($queryBuilder, 'Doctrine\ORM\QueryBuilder or \Closure');
diff --git a/composer.json b/composer.json
index 0d1561d..097a14a 100644
--- a/composer.json
+++ b/composer.json
@@ -3,8 +3,8 @@
     "description": "Provides the \"entity_id\" type (read \"entity identifier\")",
     "license": "MIT",
     "require": {
-        "symfony/symfony": ">=2.1,<2.7-dev",
-        "symfony/framework-bundle": ">=2.1,<2.7-dev",
+        "symfony/symfony": ">=2.1,<=3.0.x-dev",
+        "symfony/framework-bundle": ">=2.1,<=3.0.x-dev",
         "doctrine/doctrine-bundle": "*",
         "doctrine/orm": "*"
     },