diff --git a/composer.json b/composer.json
index 217edda..c9c8238 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
     },
     "require-dev": {
         "orchestra/testbench": "^3.8|^4.0",
-        "phpunit/phpunit": "^8.2",
+        "phpunit/phpunit": "^8.4",
         "spatie/test-time": "^1.0"
     },
     "autoload": {