diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4fd6ff231..c0b2d7af9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ You should also include the user name that made the change.
 ## 12.x.x (unreleased)
 
 ### Improvements
+- Client: Add vi-VN language support
 
 ### Bugfixes
 - Client: 一度作ったwebhookの設定画面を開こうとするとページがフリーズする @syuilo
diff --git a/locales/index.js b/locales/index.js
index 98c30fe01..92cd9b467 100644
--- a/locales/index.js
+++ b/locales/index.js
@@ -36,6 +36,7 @@ const languages = [
 	'sk-SK',
 	'ug-CN',
 	'uk-UA',
+	'vi-VN',
 	'zh-CN',
 	'zh-TW',
 ];