diff --git a/src/frontend/langs/en-US.json b/src/frontend/langs/en-US.json
index 05b6059..92d9e77 100644
--- a/src/frontend/langs/en-US.json
+++ b/src/frontend/langs/en-US.json
@@ -45,6 +45,8 @@
 	"upload": "Upload",
 	"preview": "Preview",
 	"catAdjuster": "Cat Adjuster",
+	"shouldUpdateToken": "認証トークンの更新が必要です。更新しないと一部機能が正常に動作しません。",
+	"update": "更新する",
 	"_welcomeMessage": {
 		"pattern1": "Are you overnoting?",
 		"pattern2": "Are you overusing Misskey?",