diff --git a/composer.json b/composer.json
index 60be120..ac2fb7c 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     "require-dev": {
         "phpunit/phpunit": "^9.0",
         "php-coveralls/php-coveralls": "^2.2",
-        "vimeo/psalm": "5.11.0"
+        "vimeo/psalm": "5.15.0"
     },
     "suggest": {
         "ext-timezonedb": "This PECL extension provides up-to-date timezone information"