diff --git a/app/javascript/dashboard/i18n/locale/ja/conversation.json b/app/javascript/dashboard/i18n/locale/ja/conversation.json
index 793f00cc8..a45aaa7cd 100644
--- a/app/javascript/dashboard/i18n/locale/ja/conversation.json
+++ b/app/javascript/dashboard/i18n/locale/ja/conversation.json
@@ -233,6 +233,7 @@
       "TIP_AUDIORECORDER_ERROR": "音声を開けませんでした",
       "AUDIO_CONVERSION_FAILED": "Audio conversion failed. Please try again.",
       "DRAG_DROP": "添付するにはここにドラッグ＆ドロップ",
+      "IMAGE_UPLOAD_SUCCESS": "画像が正常にアップロードされました",
       "START_AUDIO_RECORDING": "音声録音を開始",
       "STOP_AUDIO_RECORDING": "音声録音を停止",
       "COPILOT_THINKING": "Copilotが考え中",