diff --git a/composer.json b/composer.json
index 8930b9d..a84470d 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
   "require-dev": {
     "ergebnis/composer-normalize": "2.25.1",
     "phpstan/phpstan": "1.5.4",
-    "phpunit/phpunit": "9.5.19",
+    "phpunit/phpunit": "9.5.20",
     "roave/security-advisories": "dev-latest"
   },
   "autoload": {