diff --git a/composer.json b/composer.json
index c2c3ba1..926afd1 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.2"
+        "phpunit/phpunit": "^7.5"
     },
     "extra": {
         "branch-alias": {