diff --git a/composer.json b/composer.json
index f5a9296..c7c0f3c 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "php": ">=7.4",
         "seld/jsonlint": "^1.11",
         "swaggest/json-schema": "^0.12.42",
-        "symfony/polyfill-php81": "^1.30",
+        "symfony/polyfill-php81": "^1.31",
         "ext-json": "*",
         "ext-libxml": "*",
         "ext-simplexml": "*",