diff --git a/packages/artifacts/package.json b/packages/artifacts/package.json
index ec3268d..7a05fa5 100644
--- a/packages/artifacts/package.json
+++ b/packages/artifacts/package.json
@@ -19,7 +19,7 @@
     "dev": "tsc --build --watch"
   },
   "dependencies": {
-    "zod": "3.25.76"
+    "zod": "4.3.6"
   },
   "devDependencies": {
     "@types/node": "20.17.6",
diff --git a/packages/mcp-server/package.json b/packages/mcp-server/package.json
index 3925469..bbe7b58 100644
--- a/packages/mcp-server/package.json
+++ b/packages/mcp-server/package.json
@@ -25,7 +25,7 @@
     "@modelcontextprotocol/sdk": "1.29.0",
     "@quorum/artifacts": "workspace:*",
     "@quorum/store": "workspace:*",
-    "zod": "3.25.76"
+    "zod": "4.3.6"
   },
   "devDependencies": {
     "@types/node": "20.17.6",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 494425a..eab343a 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -33,8 +33,8 @@ importers:
   packages/artifacts:
     dependencies:
       zod:
-        specifier: 3.25.76
-        version: 3.25.76
+        specifier: 4.3.6
+        version: 4.3.6
     devDependencies:
       '@types/node':
         specifier: 20.17.6
@@ -84,7 +84,7 @@ importers:
     dependencies:
       '@modelcontextprotocol/sdk':
         specifier: 1.29.0
-        version: 1.29.0(zod@3.25.76)
+        version: 1.29.0(zod@4.3.6)
       '@quorum/artifacts':
         specifier: workspace:*
         version: link:../artifacts
@@ -92,8 +92,8 @@ importers:
         specifier: workspace:*
         version: link:../store
       zod:
-        specifier: 3.25.76
-        version: 3.25.76
+        specifier: 4.3.6
+        version: 4.3.6
     devDependencies:
       '@types/node':
         specifier: 20.17.6
@@ -1584,8 +1584,8 @@ 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==}
 
 snapshots:
 
@@ -1729,7 +1729,7 @@ snapshots:
 
   '@kwsites/promise-deferred@1.1.1': {}
 
-  '@modelcontextprotocol/sdk@1.29.0(zod@3.25.76)':
+  '@modelcontextprotocol/sdk@1.29.0(zod@4.3.6)':
     dependencies:
       '@hono/node-server': 1.19.14(hono@4.12.14)
       ajv: 8.18.0
@@ -1746,8 +1746,8 @@ 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
 
@@ -2968,8 +2968,8 @@ snapshots:
 
   yocto-queue@0.1.0: {}
 
-  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: {}