diff --git a/package-lock.json b/package-lock.json
index 11daa642..153ba634 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9554,9 +9554,9 @@
       }
     },
     "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"
@@ -9583,7 +9583,7 @@
         "@types/yargs": "^17.0.33",
         "process": "^0.11.10",
         "yargs": "^18.0.0",
-        "zod": "^3.25.76"
+        "zod": "^4.0.0"
       },
       "bin": {
         "backupdr-mcp": "dist/bundle.js"
@@ -9617,7 +9617,7 @@
         "@modelcontextprotocol/sdk": "^1.26.0",
         "@types/yargs": "^17.0.33",
         "yargs": "^18.0.0",
-        "zod": "^3.25.76"
+        "zod": "^4.0.0"
       },
       "bin": {
         "gcloud-mcp": "dist/bundle.js"
@@ -9651,7 +9651,7 @@
         "google-auth-library": "^10.1.0",
         "googleapis": "^171.0.0",
         "yargs": "^18.0.0",
-        "zod": "^3.25.76"
+        "zod": "^4.0.0"
       },
       "bin": {
         "observability-mcp": "dist/bundle.js"
@@ -9694,7 +9694,7 @@
         "iconv-lite": "^0.7.0",
         "mime-types": "^2.1.35",
         "yargs": "^18.0.0",
-        "zod": "^3.25.76"
+        "zod": "^4.0.0"
       },
       "bin": {
         "storage-mcp": "dist/bundle.js"
diff --git a/packages/backupdr-mcp/package.json b/packages/backupdr-mcp/package.json
index 2f569f8e..0178c77e 100644
--- a/packages/backupdr-mcp/package.json
+++ b/packages/backupdr-mcp/package.json
@@ -67,6 +67,6 @@
     "@types/yargs": "^17.0.33",
     "process": "^0.11.10",
     "yargs": "^18.0.0",
-    "zod": "^3.25.76"
+    "zod": "^4.0.0"
   }
 }
diff --git a/packages/gcloud-mcp/package.json b/packages/gcloud-mcp/package.json
index fba25ae8..d20e8c94 100644
--- a/packages/gcloud-mcp/package.json
+++ b/packages/gcloud-mcp/package.json
@@ -59,6 +59,6 @@
     "@modelcontextprotocol/sdk": "^1.26.0",
     "@types/yargs": "^17.0.33",
     "yargs": "^18.0.0",
-    "zod": "^3.25.76"
+    "zod": "^4.0.0"
   }
 }
diff --git a/packages/observability-mcp/package.json b/packages/observability-mcp/package.json
index a197b515..eb2c0b2c 100644
--- a/packages/observability-mcp/package.json
+++ b/packages/observability-mcp/package.json
@@ -44,7 +44,7 @@
     "googleapis": "^171.0.0",
     "@types/yargs": "^17.0.33",
     "yargs": "^18.0.0",
-    "zod": "^3.25.76"
+    "zod": "^4.0.0"
   },
   "devDependencies": {
     "typescript": "^5.9.2",
diff --git a/packages/storage-mcp/package.json b/packages/storage-mcp/package.json
index 64aaeebf..81e5a578 100644
--- a/packages/storage-mcp/package.json
+++ b/packages/storage-mcp/package.json
@@ -71,6 +71,6 @@
     "iconv-lite": "^0.7.0",
     "mime-types": "^2.1.35",
     "yargs": "^18.0.0",
-    "zod": "^3.25.76"
+    "zod": "^4.0.0"
   }
 }