diff --git a/lib/core/enums/sns_provider_type.dart b/lib/core/enums/sns_provider_type.dart
index 550d43a..73c0c7f 100644
--- a/lib/core/enums/sns_provider_type.dart
+++ b/lib/core/enums/sns_provider_type.dart
@@ -2,7 +2,7 @@ import 'package:freezed_annotation/freezed_annotation.dart';
 
 enum SnsProviderType {
   @JsonValue('kakao')
-  kakao(providerId: 'kakao.com'),
+  kakao(providerId: 'oidc.kakao'),
   @JsonValue('google')
   google(providerId: 'google.com'),
   @JsonValue('apple')
diff --git a/lib/features/auth/data/remote/auth_remote_data_source_impl.dart b/lib/features/auth/data/remote/auth_remote_data_source_impl.dart
index c891c6f..a6a0a1f 100644
--- a/lib/features/auth/data/remote/auth_remote_data_source_impl.dart
+++ b/lib/features/auth/data/remote/auth_remote_data_source_impl.dart
@@ -3,6 +3,7 @@ import 'package:flutter/services.dart';
 import 'package:google_sign_in/google_sign_in.dart';
 import 'package:kakao_flutter_sdk_user/kakao_flutter_sdk_user.dart';
 import 'package:pets_next_door_flutter/app/env/flavors.dart';
+import 'package:pets_next_door_flutter/core/enums/sns_provider_type.dart';
 import 'package:pets_next_door_flutter/core/network_handling/app_dio.dart';
 import 'package:pets_next_door_flutter/core/network_handling/exceptions/custom_exception.dart';
 import 'package:pets_next_door_flutter/features/auth/api/auth_api.dart';
@@ -41,14 +42,11 @@ final class AuthRemoteDataSourceImpl implements AuthRemoteDataSource {
 
   @override
   Future<UserCredential> signInWithKakao() async {
-    String customToken;
+    OAuthToken oAuthToken;
 
     if (await isKakaoTalkInstalled()) {
       try {
-        customToken = await UserApi.instance
-            .loginWithKakaoAccount()
-            .then((oAuthToken) => _getFirebaseAuthToken(oAuthToken))
-            .then((customToken) => customToken);
+        oAuthToken = await UserApi.instance.loginWithKakaoTalk();
       } catch (error) {
         // 사용자가 카카오톡 설치 후 디바이스 권한 요청 화면에서 로그인을 취소한 경우,
         // 의도적인 로그인 취소로 보고 카카오계정으로 로그인 시도 없이 로그인 취소로 처리 (예: 뒤로 가기)
@@ -58,10 +56,7 @@ final class AuthRemoteDataSourceImpl implements AuthRemoteDataSource {
 
         // 카카오톡에 연결된 카카오계정이 없는 경우, 카카오계정으로 로그인
         try {
-          customToken = await UserApi.instance
-              .loginWithKakaoAccount()
-              .then((oAuthToken) => _getFirebaseAuthToken(oAuthToken))
-              .then((customToken) => customToken);
+          oAuthToken = await UserApi.instance.loginWithKakaoAccount();
         } catch (error) {
           // print('카카오계정으로 로그인 실패 $error');
           throw error;
@@ -70,25 +65,25 @@ final class AuthRemoteDataSourceImpl implements AuthRemoteDataSource {
     } else {
       try {
         // print('카카오계정으로 로그인 성공');
-        customToken = await UserApi.instance
-            .loginWithKakaoAccount()
-            .then((oAuthToken) => _getFirebaseAuthToken(oAuthToken))
-            .then((customToken) => customToken);
-        return _firebaseAuth.signInWithCustomToken(customToken);
+        oAuthToken = await UserApi.instance.loginWithKakaoAccount();
+        // return _firebaseAuth.signInWithoAuthToken(oAuthToken);
       } catch (error) {
         throw error;
       }
     }
-    return _firebaseAuth.signInWithCustomToken(customToken);
+
+    final credential =
+        OAuthProvider(SnsProviderType.kakao.providerId).credential(
+      idToken: oAuthToken.idToken,
+    );
+
+    final userCredential = await _firebaseAuth.signInWithCredential(credential);
+
+    return userCredential;
   }
 
   @override
   Future<void> signOut() {
     return _firebaseAuth.signOut();
   }
-
-  Future<String> _getFirebaseAuthToken(OAuthToken oAuthToken) async {
-    final customToken = await _authAPI.customToken(oAuthToken.accessToken);
-    return customToken;
-  }
 }
diff --git a/lib/features/auth/repositories/auth_repository.dart b/lib/features/auth/repositories/auth_repository.dart
index fbfe45d..f8db865 100644
--- a/lib/features/auth/repositories/auth_repository.dart
+++ b/lib/features/auth/repositories/auth_repository.dart
@@ -1,10 +1,8 @@
 import 'package:firebase_auth/firebase_auth.dart';
-import 'package:kakao_flutter_sdk_user/kakao_flutter_sdk_user.dart';
 import 'package:pets_next_door_flutter/core/enums/sns_provider_type.dart';
 import 'package:pets_next_door_flutter/core/utils/result.dart';
 
 abstract interface class AuthRepository {
   Future<Result<UserCredential>> signInOAuth(SnsProviderType provider);
   Future<Result<void>> signOut();
-  Future<Result<String>> customToken(OAuthToken oAuthToken);
 }
diff --git a/lib/features/auth/repositories/auth_repository_impl.dart b/lib/features/auth/repositories/auth_repository_impl.dart
index f2be49e..2d54e06 100644
--- a/lib/features/auth/repositories/auth_repository_impl.dart
+++ b/lib/features/auth/repositories/auth_repository_impl.dart
@@ -1,5 +1,4 @@
 import 'package:firebase_auth/firebase_auth.dart';
-import 'package:kakao_flutter_sdk_auth/src/model/oauth_token.dart';
 import 'package:pets_next_door_flutter/core/enums/sns_provider_type.dart';
 import 'package:pets_next_door_flutter/core/utils/result.dart';
 import 'package:pets_next_door_flutter/features/auth/data/remote/auth_remote_data_source.dart';
@@ -39,10 +38,4 @@ final class AuthRepositoryImpl implements AuthRepository {
       return Result.failure(e);
     }
   }
-
-  @override
-  Future<Result<String>> customToken(OAuthToken oAuthToken) {
-    // TODO: implement customToken
-    throw UnimplementedError();
-  }
 }
diff --git a/lib/features/auth/usecases/get_custom_token_use_case.dart b/lib/features/auth/usecases/get_custom_token_use_case.dart
deleted file mode 100644
index a56b391..0000000
--- a/lib/features/auth/usecases/get_custom_token_use_case.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-import 'package:firebase_auth/firebase_auth.dart';
-import 'package:kakao_flutter_sdk_user/kakao_flutter_sdk_user.dart';
-import 'package:pets_next_door_flutter/core/utils/result.dart';
-import 'package:pets_next_door_flutter/features/auth/repositories/auth_repository.dart';
-
-final class GetCustomTokenUseCase {
-  const GetCustomTokenUseCase(
-    this._authRepository,
-  );
-
-  final AuthRepository _authRepository;
-
-  Future<Result<UserCredential>> call(OAuthToken oAuthToken) async {
-// TODO: 커스텀 토큰 발급 로직 붙이기
-    throw UnimplementedError();
-  }
-}
diff --git a/lib/presentation/pages/sign_in/widgets/start_with_kakao_button.dart b/lib/presentation/pages/sign_in/widgets/start_with_kakao_button.dart
index eab6c1f..71f9f04 100644
--- a/lib/presentation/pages/sign_in/widgets/start_with_kakao_button.dart
+++ b/lib/presentation/pages/sign_in/widgets/start_with_kakao_button.dart
@@ -16,9 +16,7 @@ class StartWithKakaoButton extends ConsumerWidget with SignInEvent {
   Widget build(BuildContext context, WidgetRef ref) {
     return GestureDetector(
       onTap: () async {
-        // TODO: 아직 CustomToken 발급 API가 나오지 않아서 불가능
-        ToastService.show(NormalToast(message: '현재 카카오 로그인이 불가합니다.'));
-        // await onTapSignInWithKakao(ref);
+        await onTapSignInWithKakao(ref);
       },
       child: SvgPicture.asset(PNDSvgs.kakao),
     );
diff --git a/lib/presentation/pages/splash/splash_event.dart b/lib/presentation/pages/splash/splash_event.dart
index 49993c8..0608505 100644
--- a/lib/presentation/pages/splash/splash_event.dart
+++ b/lib/presentation/pages/splash/splash_event.dart
@@ -20,7 +20,7 @@ mixin class SplashEvent implements _SplashEvent {
 
     final userData =
         await ref.read(userDataProvider.future).onError((error, stackTrace) {
-      ref.context.goNamed(AppRoute.signIn.name);
+      return null;
     });
 
     if (userData != null) {