diff --git a/composer.json b/composer.json
index b5005d2..41fb689 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
         "php": ">=5.3.3"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.0"
+        "phpunit/phpunit": "~4.4"
     },
     "autoload": {
         "classmap": [