diff --git a/composer.json b/composer.json
index 4f11ec6..46ffb58 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         "guzzlehttp/guzzle": "^7.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "~5 || ~7",
+        "phpunit/phpunit": "^9.6.18",
         "mockery/mockery": "^1.1"
     },
     "extra": {