diff --git a/composer.json b/composer.json
index fce69c6..6a84065 100644
--- a/composer.json
+++ b/composer.json
@@ -39,7 +39,7 @@
         "phpstan/phpstan": "0.12.40",
         "phpstan/phpstan-phpunit": "0.12.16",
         "phpstan/phpstan-strict-rules": "0.12.4",
-        "phpunit/phpunit": "^9.4",
+        "phpunit/phpunit": "9.4.3",
         "psalm/plugin-phpunit": "^0.13.0",
         "simpod/php-coveralls-mirror": "^3.0",
         "thecodingmachine/phpstan-safe-rule": "^1.0",