diff --git a/composer.json b/composer.json
index e32b73aa6..ba66258c4 100644
--- a/composer.json
+++ b/composer.json
@@ -22,6 +22,7 @@
     "require-dev": {
         "ext-gd": "*",
         "guzzlehttp/guzzle": "^6.0|^7.0",
+        "phpunit/phpunit": "^9.0",
         "orchestra/testbench": "^6.0|^7.0|^8.0"
     },
     "autoload": {