diff --git a/composer.json b/composer.json
index c538810..43fb4ff 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^9.6.7",
-        "vimeo/psalm": "^5.9",
+        "vimeo/psalm": "^6.0",
         "webimpress/coding-standard": "^1.3.1"
     },
     "autoload": {