diff --git a/composer.json b/composer.json
index e6b89eb3..10bf349a 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     }
   },
   "require-dev": {
-    "phpunit/phpunit": "^7.5|^8.0",
+    "phpunit/phpunit": "10.5.9",
     "guzzlehttp/guzzle": "^7.2"
   },
   "autoload-dev": {