diff --git a/composer.json b/composer.json
index a1f3c281..50ce0e35 100644
--- a/composer.json
+++ b/composer.json
@@ -37,7 +37,7 @@
         "phpstan/phpstan-deprecation-rules": "^0.12",
         "phpstan/phpstan-phpunit": "^0.12",
         "phpstan/phpstan-strict-rules": "^0.12",
-        "phpunit/phpunit": "^9.0",
+        "phpunit/phpunit": "^9.1",
         "squizlabs/php_codesniffer": "^3.5",
         "twig/twig": "^3.0"
     },