diff --git a/packages/cli/package.json b/packages/cli/package.json
index 4441501..5df995f 100644
--- a/packages/cli/package.json
+++ b/packages/cli/package.json
@@ -32,7 +32,7 @@
     "hono": "^4.6.13",
     "picomatch": "^4.0.2",
     "yaml": "^2.8.0",
-    "zod": "^3.24.4"
+    "zod": "^4.4.2"
   },
   "devDependencies": {
     "@backlog/claims": "workspace:*",
diff --git a/packages/desktop/package.json b/packages/desktop/package.json
index 8491230..6c2761a 100644
--- a/packages/desktop/package.json
+++ b/packages/desktop/package.json
@@ -41,7 +41,7 @@
     "hono": "^4.6.13",
     "picomatch": "^4.0.2",
     "yaml": "^2.8.0",
-    "zod": "^3.24.4"
+    "zod": "^4.4.2"
   },
   "devDependencies": {
     "@types/node": "^24.0.0",
diff --git a/packages/schemas/package.json b/packages/schemas/package.json
index 7a2ecbc..d2fb89b 100644
--- a/packages/schemas/package.json
+++ b/packages/schemas/package.json
@@ -9,6 +9,6 @@
     "build": "tsc -b"
   },
   "dependencies": {
-    "zod": "^3.24.4"
+    "zod": "^4.4.2"
   }
 }
diff --git a/packages/server/package.json b/packages/server/package.json
index 7afa7bb..67fd04a 100644
--- a/packages/server/package.json
+++ b/packages/server/package.json
@@ -32,7 +32,7 @@
     "@hono/node-server": "^1.13.7",
     "execa": "^9.6.0",
     "hono": "^4.6.13",
-    "zod": "^3.24.4"
+    "zod": "^4.4.2"
   },
   "devDependencies": {
     "tsx": "^4.20.3",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 007e710..e1fb379 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -65,7 +65,7 @@ importers:
     dependencies:
       '@anthropic-ai/sdk':
         specifier: ^0.91.1
-        version: 0.91.1(zod@3.25.76)
+        version: 0.91.1(zod@4.4.2)
       '@hono/node-server':
         specifier: ^1.13.7
         version: 1.19.14(hono@4.12.15)
@@ -88,8 +88,8 @@ importers:
         specifier: ^2.8.0
         version: 2.8.3
       zod:
-        specifier: ^3.24.4
-        version: 3.25.76
+        specifier: ^4.4.2
+        version: 4.4.2
     devDependencies:
       '@backlog/claims':
         specifier: workspace:*
@@ -168,7 +168,7 @@ importers:
     dependencies:
       '@anthropic-ai/sdk':
         specifier: ^0.91.1
-        version: 0.91.1(zod@3.25.76)
+        version: 0.91.1(zod@4.4.2)
       '@backlog/claims':
         specifier: workspace:*
         version: link:../claims
@@ -212,8 +212,8 @@ importers:
         specifier: ^2.8.0
         version: 2.8.3
       zod:
-        specifier: ^3.24.4
-        version: 3.25.76
+        specifier: ^4.4.2
+        version: 4.4.2
     devDependencies:
       '@types/node':
         specifier: ^24.0.0
@@ -245,8 +245,8 @@ importers:
   packages/schemas:
     dependencies:
       zod:
-        specifier: ^3.24.4
-        version: 3.25.76
+        specifier: ^4.4.2
+        version: 4.4.2
 
   packages/sdk:
     dependencies:
@@ -274,7 +274,7 @@ importers:
     dependencies:
       '@anthropic-ai/sdk':
         specifier: ^0.91.1
-        version: 0.91.1(zod@3.25.76)
+        version: 0.91.1(zod@4.4.2)
       '@backlog/claims':
         specifier: workspace:*
         version: link:../claims
@@ -306,8 +306,8 @@ importers:
         specifier: ^4.6.13
         version: 4.12.15
       zod:
-        specifier: ^3.24.4
-        version: 3.25.76
+        specifier: ^4.4.2
+        version: 4.4.2
     devDependencies:
       tsx:
         specifier: ^4.20.3
@@ -2946,18 +2946,18 @@ packages:
     resolution: {integrity: sha512-9qv4rlDiopXg4E69k+vMHjNN63YFMe9sZMrdlvKnCjlCRWeCBswPPMPUfx+ipsAWq1LXHe70RcbaHdJJpS6hyQ==}
     engines: {node: '>= 10'}
 
-  zod@3.25.76:
-    resolution: {integrity: sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==}
+  zod@4.4.2:
+    resolution: {integrity: sha512-IynmDyxsEsb9RKzO3J9+4SxXnl2FTFSzNBaKKaMV6tsSk0rw9gYw9gs+JFCq/qk2LCZ78KDwyj+Z289TijSkUw==}
 
 snapshots:
 
   7zip-bin@5.2.0: {}
 
-  '@anthropic-ai/sdk@0.91.1(zod@3.25.76)':
+  '@anthropic-ai/sdk@0.91.1(zod@4.4.2)':
     dependencies:
       json-schema-to-ts: 3.1.1
     optionalDependencies:
-      zod: 3.25.76
+      zod: 4.4.2
 
   '@babel/code-frame@7.29.0':
     dependencies:
@@ -3499,6 +3499,14 @@ snapshots:
     optionalDependencies:
       vite: 7.3.2(@types/node@24.12.2)(tsx@4.21.0)(yaml@2.8.3)
 
+  '@vitest/mocker@3.2.4(vite@7.3.2(@types/node@25.6.0)(tsx@4.21.0)(yaml@2.8.3))':
+    dependencies:
+      '@vitest/spy': 3.2.4
+      estree-walker: 3.0.3
+      magic-string: 0.30.21
+    optionalDependencies:
+      vite: 7.3.2(@types/node@25.6.0)(tsx@4.21.0)(yaml@2.8.3)
+
   '@vitest/mocker@4.1.5(vite@7.3.2(@types/node@25.6.0)(tsx@4.21.0)(yaml@2.8.3))':
     dependencies:
       '@vitest/spy': 4.1.5
@@ -5565,7 +5573,7 @@ snapshots:
     dependencies:
       '@types/chai': 5.2.3
       '@vitest/expect': 3.2.4
-      '@vitest/mocker': 3.2.4(vite@7.3.2(@types/node@24.12.2)(tsx@4.21.0)(yaml@2.8.3))
+      '@vitest/mocker': 3.2.4(vite@7.3.2(@types/node@25.6.0)(tsx@4.21.0)(yaml@2.8.3))
       '@vitest/pretty-format': 3.2.4
       '@vitest/runner': 3.2.4
       '@vitest/snapshot': 3.2.4
@@ -5700,4 +5708,4 @@ snapshots:
       compress-commons: 4.1.2
       readable-stream: 3.6.2
 
-  zod@3.25.76: {}
+  zod@4.4.2: {}