diff --git a/composer.json b/composer.json
index 09bbae4..f221077 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
         "psr/http-message": "^1.1",
         "slim/slim": "^4.12",
         "twig/twig": "^3.7",
-        "symfony/polyfill-php81": "^1.27"
+        "symfony/polyfill-php81": "^1.28"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.6",