diff --git a/services/backend/package.json b/services/backend/package.json
index bafc8444a..8bb8873a9 100644
--- a/services/backend/package.json
+++ b/services/backend/package.json
@@ -38,7 +38,7 @@
     "pino": "^9.7.0",
     "pino-pretty": "^13.0.0",
     "pug": "^3.0.2",
-    "zod": "^3.25.76",
+    "zod": "^4.0.5",
     "zod-to-json-schema": "^3.24.6"
   },
   "devDependencies": {