diff --git a/web/app/composer.json.dist b/web/app/composer.json.dist
index eb17003..1982a45 100644
--- a/web/app/composer.json.dist
+++ b/web/app/composer.json.dist
@@ -4,7 +4,7 @@
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "2.*",
-        "phpunit/phpunit": "5.7.*",
+        "phpunit/phpunit": "^6.0",
         "apigen/apigen": "^4.1.2"
     },
     "autoload": {