diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..735e28f
--- /dev/null
+++ b/.env.example
@@ -0,0 +1 @@
+CLIENT_SECRET=
\ No newline at end of file
diff --git a/server.js b/server.js
index 3656424..d05c71a 100644
--- a/server.js
+++ b/server.js
@@ -53,7 +53,7 @@ async function refreshAccessToken() {
             },
             body: new URLSearchParams({
                 client_id: "16435018183-9a880bertda0en85387ge8f8mgsves71.apps.googleusercontent.com",
-                client_secret: "YOUR_CLIENT_SECRET", // 실제 클라이언트 시크릿으로 변경 필요
+                client_secret: process.env.CLIENT_SECRET, // 실제 클라이언트 시크릿으로 변경 필요
                 refresh_token: tokenStorage.refreshToken,
                 grant_type: 'refresh_token'
             })
@@ -78,7 +78,7 @@ async function refreshAccessToken() {
 }
 
 app.get("/", (req, res) => {
- 	const clientId = "16435018183-9a880bertda0en85387ge8f8mgsves71.apps.googleusercontent.com";  // 반드시 수정
+    const clientId = "16435018183-9a880bertda0en85387ge8f8mgsves71.apps.googleusercontent.com";  // 반드시 수정
     const redirectUri = "https://google-oauth-access-token-whs.hako.li/callback";
 
     const authUrl = "https://accounts.google.com/o/oauth2/v2/auth?" +