diff --git a/packages/mcp/package.json b/packages/mcp/package.json
index 8b1680a..e538643 100644
--- a/packages/mcp/package.json
+++ b/packages/mcp/package.json
@@ -12,6 +12,6 @@
   "dependencies": {
     "@axiom-labs/arc-core": "workspace:*",
     "@modelcontextprotocol/sdk": "^1.29.0",
-    "zod": "^3.25.0"
+    "zod": "^4.3.6"
   }
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 94afae2..497032c 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -29,7 +29,7 @@ importers:
     devDependencies:
       '@modelcontextprotocol/sdk':
         specifier: ^1.29.0
-        version: 1.29.0(zod@3.25.76)
+        version: 1.29.0(zod@4.3.6)
       '@types/node':
         specifier: ^25
         version: 25.5.2
@@ -107,10 +107,10 @@ importers:
         version: link:../core
       '@modelcontextprotocol/sdk':
         specifier: ^1.29.0
-        version: 1.29.0(zod@3.25.76)
+        version: 1.29.0(zod@4.3.6)
       zod:
-        specifier: ^3.25.0
-        version: 3.25.76
+        specifier: ^4.3.6
+        version: 4.3.6
 
   site:
     dependencies:
@@ -3113,8 +3113,8 @@ packages:
     peerDependencies:
       zod: ^3.25.28 || ^4
 
-  zod@3.25.76:
-    resolution: {integrity: sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==}
+  zod@4.3.6:
+    resolution: {integrity: sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg==}
 
   zwitch@2.0.4:
     resolution: {integrity: sha512-bXE4cR/kVZhKZX/RjPEflHaKVhUVl85noU3v6b8apfQEc1x4A+zBxjZ4lN8LqGd6WZ3dl98pY4o717VFmoPp+A==}
@@ -3789,7 +3789,7 @@ snapshots:
       '@jridgewell/resolve-uri': 3.1.2
       '@jridgewell/sourcemap-codec': 1.5.5
 
-  '@modelcontextprotocol/sdk@1.29.0(zod@3.25.76)':
+  '@modelcontextprotocol/sdk@1.29.0(zod@4.3.6)':
     dependencies:
       '@hono/node-server': 1.19.12(hono@4.12.10)
       ajv: 8.18.0
@@ -3806,8 +3806,8 @@ snapshots:
       json-schema-typed: 8.0.2
       pkce-challenge: 5.0.1
       raw-body: 3.0.2
-      zod: 3.25.76
-      zod-to-json-schema: 3.25.2(zod@3.25.76)
+      zod: 4.3.6
+      zod-to-json-schema: 3.25.2(zod@4.3.6)
     transitivePeerDependencies:
       - supports-color
 
@@ -5848,10 +5848,10 @@ snapshots:
 
   yoga-layout@3.2.1: {}
 
-  zod-to-json-schema@3.25.2(zod@3.25.76):
+  zod-to-json-schema@3.25.2(zod@4.3.6):
     dependencies:
-      zod: 3.25.76
+      zod: 4.3.6
 
-  zod@3.25.76: {}
+  zod@4.3.6: {}
 
   zwitch@2.0.4: {}