diff --git a/package-lock.json b/package-lock.json
index fca1f794..cc288de7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -29,7 +29,7 @@
         "pino-pretty": "^13.1.3",
         "prom-client": "^15.1.3",
         "semver": "^7.6.3",
-        "zod": "^3.25.67"
+        "zod": "^4.3.6"
       },
       "bin": {
         "mittwald-mcp-server": "build/index.js"
@@ -13157,9 +13157,9 @@
       "license": "MIT"
     },
     "node_modules/zod": {
-      "version": "3.25.76",
-      "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
-      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
+      "version": "4.3.6",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.3.6.tgz",
+      "integrity": "sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg==",
       "license": "MIT",
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
diff --git a/package.json b/package.json
index e71c49f0..c5f3f173 100644
--- a/package.json
+++ b/package.json
@@ -92,7 +92,7 @@
     "pino-pretty": "^13.1.3",
     "prom-client": "^15.1.3",
     "semver": "^7.6.3",
-    "zod": "^3.25.67"
+    "zod": "^4.3.6"
   },
   "devDependencies": {
     "@mittwald/cli": "^1.12.0",