diff --git a/app/package.json b/app/package.json
index 0c287eec..3733ad8b 100644
--- a/app/package.json
+++ b/app/package.json
@@ -35,7 +35,7 @@
     "react-leaflet": "^5.0.0",
     "recharts": "^2.15.3",
     "utility-types": "^3.11.0",
-    "zod": "^3.23.8",
+    "zod": "^4.0.5",
     "zustand": "^4.5.4"
   },
   "devDependencies": {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index d1a3732b..b3ab9ce7 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -87,8 +87,8 @@ importers:
         specifier: ^3.11.0
         version: 3.11.0
       zod:
-        specifier: ^3.23.8
-        version: 3.25.76
+        specifier: ^4.0.5
+        version: 4.0.5
       zustand:
         specifier: ^4.5.4
         version: 4.5.7(@types/react@19.1.8)(immer@10.1.1)(react@19.1.0)
@@ -3731,6 +3731,9 @@ packages:
   zod@3.25.76:
     resolution: {integrity: sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==}
 
+  zod@4.0.5:
+    resolution: {integrity: sha512-/5UuuRPStvHXu7RS+gmvRf4NXrNxpSllGwDnCBcJZtQsKrviYXm54yDGV2KYNLT5kq0lHGcl7lqWJLgSaG+tgA==}
+
   zustand@4.5.7:
     resolution: {integrity: sha512-CHOUy7mu3lbD6o6LJLfllpjkzhHXSBlX8B9+qPddUsIfeF5S/UZ5q0kmCsnRqT1UHFQZchNFDDzMbQsuesHWlw==}
     engines: {node: '>=12.7.0'}
@@ -7567,6 +7570,8 @@ snapshots:
 
   zod@3.25.76: {}
 
+  zod@4.0.5: {}
+
   zustand@4.5.7(@types/react@19.1.8)(immer@10.1.1)(react@19.1.0):
     dependencies:
       use-sync-external-store: 1.5.0(react@19.1.0)