diff --git a/chatbot/src/main/kotlin/space/mori/chzzk_bot/chatbot/chzzk/ChzzkHandler.kt b/chatbot/src/main/kotlin/space/mori/chzzk_bot/chatbot/chzzk/ChzzkHandler.kt
index cdaf73c..09b8384 100644
--- a/chatbot/src/main/kotlin/space/mori/chzzk_bot/chatbot/chzzk/ChzzkHandler.kt
+++ b/chatbot/src/main/kotlin/space/mori/chzzk_bot/chatbot/chzzk/ChzzkHandler.kt
@@ -11,6 +11,7 @@ import org.slf4j.Logger
 import org.slf4j.LoggerFactory
 import space.mori.chzzk_bot.chatbot.chzzk.Connector.getChannel
 import space.mori.chzzk_bot.chatbot.discord.Discord
+import space.mori.chzzk_bot.chatbot.utils.refreshAccessToken
 import space.mori.chzzk_bot.common.events.*
 import space.mori.chzzk_bot.common.models.User
 import space.mori.chzzk_bot.common.services.LiveStatusService
@@ -221,14 +222,13 @@ class UserHandler(
             throw RuntimeException("AccessToken or RefreshToken is not valid.")
         }
         try {
-
-            client = Connector.getClient(user.accessToken!!, user.refreshToken!!)
+            val tokens = Connector.client.refreshAccessToken(user.refreshToken!!)
+            client = Connector.getClient(tokens.first, tokens.second)
+            UserService.setRefreshToken(user, tokens.first, tokens.second)
 
             client.loginAsync().join()
             client.refreshTokenAsync().join()
 
-            UserService.setRefreshToken(user, client.loginResult.accessToken(), client.loginResult.refreshToken())
-
             listener = ChzzkSessionBuilder(client).buildUserSession()
 
             listener.createAndConnectAsync().join()
diff --git a/chatbot/src/main/kotlin/space/mori/chzzk_bot/chatbot/utils/accessTokenRefresh.kt b/chatbot/src/main/kotlin/space/mori/chzzk_bot/chatbot/utils/accessTokenRefresh.kt
new file mode 100644
index 0000000..c8eb9ac
--- /dev/null
+++ b/chatbot/src/main/kotlin/space/mori/chzzk_bot/chatbot/utils/accessTokenRefresh.kt
@@ -0,0 +1,55 @@
+package space.mori.chzzk_bot.chatbot.utils
+
+import com.google.gson.Gson
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.RequestBody.Companion.toRequestBody
+import space.mori.chzzk_bot.common.utils.client
+import xyz.r2turntrue.chzzk4j.ChzzkClient
+import java.io.IOException
+
+val client = OkHttpClient.Builder()
+    .addNetworkInterceptor { chain ->
+        chain.proceed(
+            chain.request()
+                .newBuilder()
+                .header("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36")
+                .build()
+        )
+    }
+    .build()
+val gson = Gson()
+
+data class RefreshTokenResponse(
+    val accessToken: String,
+    val refreshToken: String,
+    val expiresIn: Int,
+    val tokenType: String = "Bearer",
+    val scope: String
+)
+
+fun ChzzkClient.refreshAccessToken(refreshToken: String): Pair<String, String> {
+    val url = "https://openapi.chzzk.naver.com/auth/v1/token"
+    val request = Request.Builder()
+        .url(url)
+        .header("Content-Type", "application/json")
+        .post(gson.toJson(mapOf(
+            "grantType" to "refresh_token",
+            "refreshToken" to refreshToken,
+            "clientId" to this.apiClientId,
+            "clientSecret" to this.apiSecret
+        )).toRequestBody())
+        .build()
+
+    client.newCall(request).execute().use { response ->
+        try {
+            if(!response.isSuccessful) throw IOException("Unexpected code ${response.code}")
+            val body = response.body?.string()
+            val data = gson.fromJson(body, RefreshTokenResponse::class.java)
+
+            return Pair(data.accessToken, data.refreshToken)
+        } catch(e: Exception) {
+            throw e
+        }
+    }
+}
\ No newline at end of file