diff --git a/README.md b/README.md
index 02b89f5..b60ff9d 100644
--- a/README.md
+++ b/README.md
@@ -137,7 +137,7 @@ $ mkcert localhost
 #### When using `ngrok-v1`
 
 > [!WARNING]
-> This feature is experimental.
+> This feature is deprecated.
 
 Before using the `serve` command, you need to install [ngrok](https://github.com/inconshreveable/ngrok) and [node-pty](https://www.npmjs.com/package/node-pty).
 
diff --git a/src/serve/commands/index.ts b/src/serve/commands/index.ts
index d331c93..4b063ab 100644
--- a/src/serve/commands/index.ts
+++ b/src/serve/commands/index.ts
@@ -19,7 +19,7 @@ export const installServeCommands = (program: Command) => {
     )
     .option(
       "--proxy-type <proxyType>",
-      "The type of proxy to use. local-proxy, ngrok-v1, or ngrok",
+      "The type of proxy to use. local-proxy or ngrok",
       "local-proxy",
     )
     .option(
diff --git a/src/serve/proxy/ngrok-v1-proxy.ts b/src/serve/proxy/ngrok-v1-proxy.ts
index 950d102..f297bfb 100644
--- a/src/serve/proxy/ngrok-v1-proxy.ts
+++ b/src/serve/proxy/ngrok-v1-proxy.ts
@@ -25,7 +25,7 @@ async function tryImportNodePty(): Promise<typeof pty> {
 }
 
 /**
- * @experimental
+ * @deprecated
  */
 export class NgrokV1Proxy implements ProxyInterface {
   private ptyProcess?: pty.IPty;
diff --git a/src/serve/resolveProxy.ts b/src/serve/resolveProxy.ts
index 1844abf..01bb488 100644
--- a/src/serve/resolveProxy.ts
+++ b/src/serve/resolveProxy.ts
@@ -34,7 +34,9 @@ export const resolveProxy = (
   }
 
   if (options.proxyType === "ngrok-v1") {
-    console.warn("ngrok-v1 is experimental feature.");
+    console.warn(
+      `proxyType 'ngrok-v1' is deprecated. Please use 'ngrok' instead.`,
+    );
     return {
       liffAppProxy: new NgrokV1Proxy({
         ngrokCommand: options.ngrokCommand,
diff --git a/src/setup.test.ts b/src/setup.test.ts
index 22d8573..7bf26fa 100644
--- a/src/setup.test.ts
+++ b/src/setup.test.ts
@@ -107,7 +107,7 @@ Options:
   --host <host>                                           The host of the application server.
   --port <port>                                           The port number of the application server.
   -i, --inspect                                           The flag indicates LIFF app starts on debug mode. (default: false)
-  --proxy-type <proxyType>                                The type of proxy to use. local-proxy, ngrok-v1, or ngrok (default: "local-proxy")
+  --proxy-type <proxyType>                                The type of proxy to use. local-proxy or ngrok (default: "local-proxy")
   --local-proxy-port <localProxyPort>                     The port number of the application proxy server to listen on when running the CLI. (default: "9000")
   --local-proxy-inspector-port <localProxyInspectorPort>  The port number of the inspector proxy server to listen on when running the CLI. (default: "9223")
   --ngrok-command <ngrokCommand>                          The command to run ngrok. (default: "ngrok")