diff --git a/lib/i18n/dictionaries/en.json b/lib/i18n/dictionaries/en.json
index 4e43a39..745c9bb 100644
--- a/lib/i18n/dictionaries/en.json
+++ b/lib/i18n/dictionaries/en.json
@@ -100,8 +100,6 @@
         "switchTo": "Switch to",
         "minimal": "Minimal",
         "sketch": "Sketch",
-        "closeProtection": "Close Protection",
-        "closeProtectionDescription": "Show confirmation when leaving the page.",
         "diagramStyle": "Diagram Style",
         "diagramStyleDescription": "Toggle between minimal and styled diagram output.",
         "sendShortcut": "Send Shortcut",
diff --git a/lib/i18n/dictionaries/ja.json b/lib/i18n/dictionaries/ja.json
index bfafb62..9f6464d 100644
--- a/lib/i18n/dictionaries/ja.json
+++ b/lib/i18n/dictionaries/ja.json
@@ -100,8 +100,6 @@
         "switchTo": "切り替え",
         "minimal": "ミニマル",
         "sketch": "スケッチ",
-        "closeProtection": "ページ離脱確認",
-        "closeProtectionDescription": "ページを離れる際に確認を表示します。",
         "diagramStyle": "ダイアグラムスタイル",
         "diagramStyleDescription": "ミニマルとスタイル付きの出力を切り替えます。",
         "sendShortcut": "送信ショートカット",
diff --git a/lib/i18n/dictionaries/zh.json b/lib/i18n/dictionaries/zh.json
index ce431c8..5fd6df0 100644
--- a/lib/i18n/dictionaries/zh.json
+++ b/lib/i18n/dictionaries/zh.json
@@ -100,8 +100,6 @@
         "switchTo": "切换到",
         "minimal": "简约",
         "sketch": "草图",
-        "closeProtection": "关闭确认",
-        "closeProtectionDescription": "离开页面时显示确认。",
         "diagramStyle": "图表样式",
         "diagramStyleDescription": "切换简约与精致图表输出模式。",
         "sendShortcut": "发送快捷键",