diff --git a/composer.json b/composer.json
index a280b88e..64ded6ee 100644
--- a/composer.json
+++ b/composer.json
@@ -22,12 +22,14 @@
         }
     ],
     "require": {
-        "php": ">=5.2.0",
+        "php": ">=5.4.0",
         "ext-xml": "*",
         "ext-xmlwriter": "*"
     },
     "require-dev": {
-        "squizlabs/php_codesniffer": "2.*"
+        "squizlabs/php_codesniffer": "2.*",
+        "phpunit/phpunit": "4.6.*",
+        "mikey179/vfsStream": "1.5.*"
     },
     "recommend": {
         "ext-zip": "*",