diff --git a/package-lock.json b/package-lock.json
index 545bfb4..dde67dd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,7 +11,7 @@
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.24.0",
         "express": "^5.1.0",
-        "zod": "^3.23.8",
+        "zod": "^4.3.4",
         "zod-to-json-schema": "^3.24.6"
       },
       "bin": {
@@ -20,7 +20,7 @@
       "devDependencies": {
         "@types/express": "^5.0.3",
         "shx": "^0.4.0",
-        "typescript": "5.7"
+        "typescript": "~5.7.3"
       },
       "engines": {
         "node": ">=18.0.0"
@@ -605,6 +605,7 @@
       "resolved": "https://registry.npmjs.org/express/-/express-5.2.1.tgz",
       "integrity": "sha512-hIS4idWWai69NezIdRt2xFVofaF4j+6INOpJlVOLDO8zXGpUVEVzIYk12UUi2JzjEzWL3IOAxcTubgz9Po0yXw==",
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "accepts": "^2.0.0",
         "body-parser": "^2.2.1",
@@ -1758,10 +1759,11 @@
       "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": "4.3.4",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.3.4.tgz",
+      "integrity": "sha512-Zw/uYiiyF6pUT1qmKbZziChgNPRu+ZRneAsMUDU6IwmXdWt5JwcUfy2bvLOCUtz5UniaN/Zx5aFttZYbYc7O/A==",
       "license": "MIT",
+      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
diff --git a/package.json b/package.json
index f7d18fa..0b42dfc 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
   "dependencies": {
     "@modelcontextprotocol/sdk": "^1.24.0",
     "express": "^5.1.0",
-    "zod": "^3.23.8",
+    "zod": "^4.3.4",
     "zod-to-json-schema": "^3.24.6"
   },
   "devDependencies": {