diff --git a/composer.json b/composer.json
index 6e6c8d5..be5fb18 100644
--- a/composer.json
+++ b/composer.json
@@ -37,6 +37,6 @@
     }
   },
   "require-dev": {
-    "phpunit/phpunit": "^7|^8|^9|^10"
+    "phpunit/phpunit": "^7|^8|^9"
   }
 }