Fix lowest deps requirements

.travis.yml

@@ -15,7 +15,7 @@ env:
 matrix:
   fast_finish: true
   include:
-    - php: 5.3.3
+    - php: 5.3
       env: COMPOSER_FLAGS="--prefer-lowest"
     - php: 5.6
       env: SYMFONY_VERSION=2.3.*

Makefile

@@ -1,3 +1,3 @@
 test:
-	phpunit
+	php vendor/bin/phpunit -c phpunit.xml.dist
 	cd Resources/doc && sphinx-build -W -b html -d _build/doctrees . _build/html

composer.json

@@ -18,10 +18,10 @@
     ],
     "require": {
         "symfony/http-foundation": "~2.3",
-        "symfony/form": "~2.3",
+        "symfony/form": "^2.3.5",
         "symfony/security": "~2.3",
         "symfony/console": "~2.3",
-        "sonata-project/core-bundle": "^2.3.1",
+        "sonata-project/core-bundle": "^2.3.2",
         "sonata-project/admin-bundle": "~2.3",
         "friendsofsymfony/user-bundle": "~1.3",
         "sonata-project/doctrine-extensions": "~1.0",
@@ -36,8 +36,12 @@
     "require-dev": {
         "doctrine/orm": "^2.2.3",
         "sonata-project/seo-bundle": "~1.1",
+        "phpunit/phpunit": "~4.7",
         "symfony/phpunit-bridge": "~2.7|~3.0"
     },
+    "conflict": {
+        "jms/serializer": "<0.13"
+    },
     "suggest": {
         "sonata-project/doctrine-orm-admin-bundle": "~2.3",
         "sonata-project/seo-bundle": "~1.1"