diff --git a/composer.json b/composer.json
index ca7299b4..d8fc595a 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.14",
         "mockery/mockery": "^1.2",
-        "orchestra/testbench": "^3.5|^3.6|^3.7|^3.8"
+        "orchestra/testbench": "^3.5|^3.6|^3.7|^3.8|^4.0"
     },
     "suggest": {
         "laravel/telescope": "^2.0"