diff --git a/packages/coding-agent/src/cli.ts b/packages/coding-agent/src/cli.ts
index 64c14e8c..0264f537 100644
--- a/packages/coding-agent/src/cli.ts
+++ b/packages/coding-agent/src/cli.ts
@@ -1,5 +1,20 @@
 #!/usr/bin/env node
 
+// Suppress punycode deprecation warning from dependencies
+// This warning comes from old dependencies still using the deprecated punycode module
+const originalEmit = process.emit;
+// @ts-expect-error - Monkey-patch emit to filter warnings
+process.emit = (event, ...args) => {
+	if (event === "warning") {
+		const warning = args[0] as any;
+		if (warning?.name === "DeprecationWarning" && warning?.code === "DEP0040") {
+			return false; // Suppress punycode deprecation
+		}
+	}
+	// @ts-expect-error - Call original with event and args
+	return originalEmit.apply(process, [event, ...args]);
+};
+
 import { main } from "./main.js";
 
 main(process.argv.slice(2)).catch((err) => {