diff --git a/composer.json b/composer.json
index a4420ee99..d346530e2 100644
--- a/composer.json
+++ b/composer.json
@@ -42,7 +42,7 @@
         "symfony/form": "^3.0|^4.0|^5.0",
         "symfony/filesystem": "^3.0|^4.0|^5.0",
         "symfony/expression-language": "^3.0|^4.0|^5.0",
-        "phpunit/phpunit": "^7.5||^8.0",
+        "phpunit/phpunit": "^7.5||^8.0||^9.0",
         "doctrine/coding-standard": "^5.0"
     },
     "conflict": {