diff --git a/package.json b/package.json
index e6bdaca..c8d5d3d 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "tsx": "^4.21.0",
     "typescript": "~5.8.2",
     "vitest": "^4.0.18",
-    "zod": "^3.24.1"
+    "zod": "^4.3.6"
   },
   "version": "0.9.3",
   "license": "Apache-2.0",
diff --git a/packages/core/package.json b/packages/core/package.json
index f02971b..fab8740 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -29,7 +29,7 @@
   },
   "homepage": "https://github.com/Stackbilt-dev/charter#readme",
   "dependencies": {
-    "zod": "^3.24.1"
+    "zod": "^4.3.6"
   },
   "publishConfig": {
     "access": "public"
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 6078ace..b76333b 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -24,8 +24,8 @@ importers:
         specifier: ^4.0.18
         version: 4.0.18(@types/node@25.5.0)(tsx@4.21.0)
       zod:
-        specifier: ^3.24.1
-        version: 3.25.76
+        specifier: ^4.3.6
+        version: 4.3.6
 
   packages/adf: {}
 
@@ -45,7 +45,7 @@ importers:
     dependencies:
       '@modelcontextprotocol/sdk':
         specifier: ^1.29.0
-        version: 1.29.0(zod@3.25.76)
+        version: 1.29.0(zod@4.3.6)
       '@stackbilt/adf':
         specifier: workspace:^
         version: link:../adf
@@ -71,8 +71,8 @@ importers:
   packages/core:
     dependencies:
       zod:
-        specifier: ^3.24.1
-        version: 3.25.76
+        specifier: ^4.3.6
+        version: 4.3.6
 
   packages/drift:
     dependencies:
@@ -980,8 +980,8 @@ 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:
 
@@ -1069,7 +1069,7 @@ snapshots:
 
   '@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@4.12.9)
       ajv: 8.18.0
@@ -1086,8 +1086,8 @@ 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
 
@@ -1769,8 +1769,8 @@ snapshots:
 
   wrappy@1.0.2: {}
 
-  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: {}