diff --git a/composer.json b/composer.json
index 0cd09653501e0600b849ab03b7137353f586b31c..61e3f0a1a796303b7dcdb4948e5fc0bff7d22f4a 100644
--- a/composer.json
+++ b/composer.json
@@ -36,7 +36,7 @@
         "friendsofphp/php-cs-fixer": "1.11.6",
         "phploc/phploc": "2.0.6",
         "phpmd/phpmd": "1.5.0",
-        "phpunit/phpunit": "4.8.4",
+        "phpunit/phpunit": "4.8.27",
         "sebastian/phpcpd": "2.0.0",
         "squizlabs/php_codesniffer": "2.6.0"
     }