diff --git a/package.json b/package.json
index 4d2136b..119a3d3 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "remark-parse": "^11.0.0",
     "unified": "^11.0.5",
     "yaml": "^2.8.2",
-    "zod": "3",
+    "zod": "4",
     "zod-to-json-schema": "^3.25.1"
   }
 }