diff --git a/packages/core/package.json b/packages/core/package.json
index cafabb1..9664165 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -11,6 +11,6 @@
   "scripts": { "build": "tsup src/index.ts --format esm --dts --clean" },
   "dependencies": {
     "expect": "^29.7.0",
-    "zod": "^3.24.1"
+    "zod": "^4.6.5"
   }
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b1a228d..f9e5a95 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -75,8 +75,8 @@ importers:
         specifier: ^29.7.0
         version: 29.7.0
       zod:
-        specifier: ^3.24.1
-        version: 3.25.76
+        specifier: ^4.6.5
+        version: 4.6.5
 
   packages/gemini:
     dependencies:
@@ -1234,8 +1234,8 @@ packages:
     engines: {node: '>=8'}
     hasBin: true
 
-  zod@3.25.76:
-    resolution: {integrity: sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==}
+  zod@4.6.5:
+    resolution: {integrity: sha512-v5l/aFXZQeai4awLbOpSoHecE9UiMrnfx75tEXLjNonXVARxQ5mOeipTjROUchszUNCqnE+hqAMujRsRHsut2Q==}
 
 snapshots:
 
@@ -2154,4 +2154,4 @@ snapshots:
       siginfo: 2.0.0
       stackback: 0.0.2
 
-  zod@3.25.76: {}
+  zod@4.6.5: {}