diff --git a/package-lock.json b/package-lock.json
index bfbc5eb..12286b0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,7 +11,7 @@
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.29.0",
         "@runapi.ai/mcp-core": "0.5.0",
-        "zod": "^3.25.76"
+        "zod": "^4.6.5"
       },
       "bin": {
         "runapi-mcp": "dist/bin/runapi-mcp.js"
@@ -868,6 +868,15 @@
         "node": ">=22.0.0"
       }
     },
+    "node_modules/@runapi.ai/mcp-core/node_modules/zod": {
+      "version": "3.25.76",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
+      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
+    },
     "node_modules/@standard-schema/spec": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@standard-schema/spec/-/spec-1.1.0.tgz",
@@ -2959,9 +2968,9 @@
       "license": "ISC"
     },
     "node_modules/zod": {
-      "version": "3.25.76",
-      "resolved": "https://registry.npmjs.org/zod/-/zod-3.25.76.tgz",
-      "integrity": "sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==",
+      "version": "4.6.5",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.6.5.tgz",
+      "integrity": "sha512-v5l/aFXZQeai4awLbOpSoHecE9UiMrnfx75tEXLjNonXVARxQ5mOeipTjROUchszUNCqnE+hqAMujRsRHsut2Q==",
       "license": "MIT",
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
diff --git a/package.json b/package.json
index e97288c..621a1a2 100644
--- a/package.json
+++ b/package.json
@@ -67,7 +67,7 @@
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.29.0",
     "@runapi.ai/mcp-core": "0.5.0",
-    "zod": "^3.25.76"
+    "zod": "^4.6.5"
   },
   "devDependencies": {
     "@types/node": "^24.10.1",