diff --git a/package.json b/package.json
index c06b838d..5e9f59f2 100644
--- a/package.json
+++ b/package.json
@@ -67,7 +67,7 @@
   "dependencies": {
     "@agentclientprotocol/sdk": "1.3.0",
     "@anthropic-ai/claude-agent-sdk": "0.3.238",
-    "zod": "^3.25.0 || ^4.0.0"
+    "zod": "^4.0.0"
   },
   "devDependencies": {
     "@anthropic-ai/sdk": "0.120.0",