diff --git a/package-lock.json b/package-lock.json
index 8425c21..24ee07c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
         "@modelcontextprotocol/sdk": "^1.0.0",
         "better-sqlite3": "^9.4.3",
         "stripe": "^14.21.0",
-        "zod": "^3.22.4"
+        "zod": "^4.3.6"
       },
       "bin": {
         "financeops-mcp": "dist/index.js"
@@ -3313,9 +3313,9 @@
       }
     },
     "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"
diff --git a/package.json b/package.json
index aa21c7d..d1d02f2 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "@modelcontextprotocol/sdk": "^1.0.0",
     "better-sqlite3": "^9.4.3",
     "stripe": "^14.21.0",
-    "zod": "^3.22.4"
+    "zod": "^4.3.6"
   },
   "devDependencies": {
     "@types/better-sqlite3": "^7.6.8",