diff --git a/package.json b/package.json
index dd2a5c4..db08a4c 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,7 @@
     "technicalindicators": "^3.1.0",
     "undici": "^6.20.0",
     "yaml": "^2.6.0",
-    "zod": "^3.23.8"
+    "zod": "^4.4.3"
   },
   "devDependencies": {
     "@changesets/cli": "^2.31.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 8e3f135..490be2b 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -10,7 +10,7 @@ importers:
     dependencies:
       '@anthropic-ai/claude-agent-sdk':
         specifier: ^0.1.0
-        version: 0.1.77(zod@3.25.76)
+        version: 0.1.77(zod@4.4.3)
       better-sqlite3:
         specifier: ^11.5.0
         version: 11.10.0
@@ -39,8 +39,8 @@ importers:
         specifier: ^2.6.0
         version: 2.8.3
       zod:
-        specifier: ^3.23.8
-        version: 3.25.76
+        specifier: ^4.4.3
+        version: 4.4.3
     devDependencies:
       '@changesets/cli':
         specifier: ^2.31.0
@@ -1642,8 +1642,8 @@ packages:
   yoga-layout@3.2.1:
     resolution: {integrity: sha512-0LPOt3AxKqMdFBZA3HBAt/t/8vIKq7VaQYbuA8WxCgung+p9TVyKRYdpvCb80HcdTN2NkbIKbhNwKUfm3tQywQ==}
 
-  zod@3.25.76:
-    resolution: {integrity: sha512-gzUt/qt81nXsFGKIFcC3YnfEAx5NkunCfnDlvuBSSFS02bcXu4Lmea0AFIUwbLWxWPx3d9p8S5QoaujKcNQxcQ==}
+  zod@4.4.3:
+    resolution: {integrity: sha512-ytENFjIJFl2UwYglde2jchW2Hwm4GJFLDiSXWdTrJQBIN9Fcyp7n4DhxJEiWNAJMV1/BqWfW/kkg71UDcHJyTQ==}
 
 snapshots:
 
@@ -1652,9 +1652,9 @@ snapshots:
       ansi-styles: 6.2.3
       is-fullwidth-code-point: 4.0.0
 
-  '@anthropic-ai/claude-agent-sdk@0.1.77(zod@3.25.76)':
+  '@anthropic-ai/claude-agent-sdk@0.1.77(zod@4.4.3)':
     dependencies:
-      zod: 3.25.76
+      zod: 4.4.3
     optionalDependencies:
       '@img/sharp-darwin-arm64': 0.33.5
       '@img/sharp-darwin-x64': 0.33.5
@@ -3089,4 +3089,4 @@ snapshots:
 
   yoga-layout@3.2.1: {}
 
-  zod@3.25.76: {}
+  zod@4.4.3: {}