diff --git a/composer.json b/composer.json
index c59f340..e90e083 100644
--- a/composer.json
+++ b/composer.json
@@ -39,8 +39,7 @@
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "^2.3",
-        "orchestra/testbench": "3.x",
-        "phpunit/phpunit": "^4.8|^5.2|^6"
+        "orchestra/testbench": "^3"
     },
     "scripts": {
         "test": "phpunit",