diff --git a/composer.json b/composer.json
index 8adc973..4e2c627 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,7 @@
         "moontoast/math": "~1.1",
         "symfony/console": "~2.3",
         "doctrine/dbal": ">=2.3",
-        "phpunit/phpunit": "~3.7",
+        "phpunit/phpunit": "~4.1",
         "satooshi/php-coveralls": "~0.6"
     },
     "bin": ["bin/uuid"],