diff --git a/user-service/src/main/java/kr/mafoo/user/config/properties/KakaoOAuthProperties.java b/user-service/src/main/java/kr/mafoo/user/config/properties/KakaoOAuthProperties.java
index 6f983ee4..fabc6db5 100644
--- a/user-service/src/main/java/kr/mafoo/user/config/properties/KakaoOAuthProperties.java
+++ b/user-service/src/main/java/kr/mafoo/user/config/properties/KakaoOAuthProperties.java
@@ -7,6 +7,7 @@
 @ConfigurationPropertiesBinding
 public record KakaoOAuthProperties(
         String clientId,
-        String redirectUri
+        String redirectUri,
+        String clientSecret
 ) {
 }
diff --git a/user-service/src/main/java/kr/mafoo/user/service/AuthService.java b/user-service/src/main/java/kr/mafoo/user/service/AuthService.java
index 4e3a92e8..534c1395 100644
--- a/user-service/src/main/java/kr/mafoo/user/service/AuthService.java
+++ b/user-service/src/main/java/kr/mafoo/user/service/AuthService.java
@@ -74,7 +74,10 @@ private Mono<String> getKakaoTokenWithCode(String code) {
                         + "&redirect_uri="
                         + kakaoOAuthProperties.redirectUri()
                         +"&code="
-                        + code)
+                        + code
+                        + "&client_secret="
+                        + kakaoOAuthProperties.clientSecret()
+                )
                 .retrieve()
                 .onStatus(status -> !status.is2xxSuccessful(), (res) -> Mono.error(new KakaoLoginFailedException()))
                 .bodyToMono(LinkedHashMap.class)
@@ -90,7 +93,7 @@ private Mono<KakaoLoginInfo> getUserInfoWithKakaoToken(String kakaoToken){
                 .onStatus(status -> !status.is2xxSuccessful(), (res) -> Mono.error(new KakaoLoginFailedException()))
                 .bodyToMono(LinkedHashMap.class)
                 .map(map -> new KakaoLoginInfo(
-                                String.valueOf((Long) map.get("id")),
+                                String.valueOf(map.get("id")),
                                 (String) ((LinkedHashMap)map.get("properties")).get("nickname"),
                                 (String) map.get("kakao_account.email")
                 ));
diff --git a/user-service/src/main/resources/application.yaml b/user-service/src/main/resources/application.yaml
index 6bcd8a44..beaf4357 100644
--- a/user-service/src/main/resources/application.yaml
+++ b/user-service/src/main/resources/application.yaml
@@ -20,6 +20,7 @@ app:
     kakao:
       client-id: ${KAKAO_CLIENT_ID}
       redirect-uri: ${KAKAO_REDIRECT_URL}
+      client-secret: ${KAKAO_CLIENT_SECRET}
   jwt:
     verify-key: ${JWT_VERIFY_KEY}
     expiration: