diff --git a/nhn/serializers.py b/nhn/serializers.py
index b9f4186..faf3402 100644
--- a/nhn/serializers.py
+++ b/nhn/serializers.py
@@ -17,8 +17,9 @@ class TokenRequestSerializer(serializers.Serializer):
         help_text="NHN Cloud 테넌트 ID",
         max_length=64,
     )
-    username = serializers.EmailField(
-        help_text="NHN Cloud 사용자 이메일",
+    username = serializers.CharField(
+        help_text="NHN Cloud 사용자 ID (이메일 또는 API 사용자 ID)",
+        max_length=255,
     )
     password = serializers.CharField(
         help_text="NHN Cloud API 비밀번호",
diff --git a/version b/version
index 95e94cd..90ab6e9 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-v0.0.1
\ No newline at end of file
+v0.0.2
\ No newline at end of file