diff --git a/composer.json b/composer.json
index f684fc5..e6b2862 100644
--- a/composer.json
+++ b/composer.json
@@ -47,6 +47,7 @@
         "yiisoft/yii2": "~2.0.0"
     },
     "require-dev": {
+        "phpunit/phpunit": "^5.7",
         "yiisoft/yii2": "dev-master",
         "hiqdev/yii2-hiart-github": "dev-master",
         "hiqdev/hidev-php": "<2.0",