diff --git a/composer.json b/composer.json
index 3082761..901ed86 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
   },
   "require-dev": {
     "symfony/var-dumper": "^4.0",
-    "phpunit/phpunit": "^5.4",
+    "phpunit/phpunit": "^7.5",
     "monolog/monolog": "^1.3",
     "symfony/http-foundation": "^3.0",
     "symfony/validator": "^3.0"