diff --git a/composer.json b/composer.json
index 1ddfbce..6289c43 100644
--- a/composer.json
+++ b/composer.json
@@ -15,6 +15,7 @@
         "ext-tokenizer": "*"
     },
     "require-dev": {
+        "phpunit/phpunit": "3.7.*",
         "smarty/smarty": "3.*",
         "twig/twig": "1.*",
         "satooshi/php-coveralls": "dev-master"