diff --git a/composer.json b/composer.json
index 4bb41df..8966782 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
     "php": ">=8.1",
     "psx/json": "^3.0",
     "psx/openapi": "^0.1",
-    "psx/schema": "^6.0",
+    "psx/schema": "^6.3",
     "symfony/cache": "^5.0|^6.0|^7.0",
     "symfony/console": "^5.0|^6.0|^7.0",
     "symfony/yaml": "^5.0|^6.0|^7.0",