diff --git a/composer.json b/composer.json
index a4c13d9..93d32db 100644
--- a/composer.json
+++ b/composer.json
@@ -20,12 +20,12 @@
         }
     ],
     "require": {
-        "php": ">=5.3.0",
+        "php": ">=7.0",
         "ext-soap": "*",
         "ext-curl": "*",
         "ass/xmlsecurity": "~1.0",
-        "symfony/framework-bundle": "~2.0|~3.0",
-        "symfony/twig-bundle": "~2.0|~3.0",
+        "symfony/framework-bundle": "~3.4|~4.0",
+        "symfony/twig-bundle": "~3.4|~4.0",
         "zendframework/zend-mime": "2.1.*"
     },
     "replace": {
@@ -37,9 +37,10 @@
     },
     "require-dev": {
         "ext-mcrypt": "*",
-        "mikey179/vfsStream": "~1.0",
-        "symfony/filesystem": "~2.0",
-        "symfony/process": "~2.3"
+        "mikey179/vfsStream": "~1.6.5",
+        "symfony/filesystem": "~2.3",
+        "symfony/process": "~2.3",
+        "phpunit/phpunit": "^5.7"
     },
     "autoload": {
         "psr-0": { "BeSimple\\": "src/" }