diff --git a/package.json b/package.json
index 357057e..f78bc1f 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
     "aws4fetch": "^1.0.20",
     "fast-xml-parser": "^5.2.3",
     "hono": "^4.7.10",
-    "zod": "^3.25.23"
+    "zod": "^4.0.0"
   },
   "devDependencies": {
     "@biomejs/biome": "^1.9.4",