diff --git a/docs/sphinx/en/about/info.rst b/docs/sphinx/en/about/info.rst
index 7e8d411e..9fa57393 100644
--- a/docs/sphinx/en/about/info.rst
+++ b/docs/sphinx/en/about/info.rst
@@ -20,6 +20,7 @@ TeNeS is developed by the following members.
 Version information
 ======================
 
+- ver. 2.1.0: released on 2024-02-28.
 - ver. 2.0.0: released on 2023-11-17.
 - ver. 2.0-beta: released on 2023-10-25.
 - ver. 1.3.4: released on 2023-09-13.
diff --git a/docs/sphinx/ja/about/info.rst b/docs/sphinx/ja/about/info.rst
index af27decc..41120484 100644
--- a/docs/sphinx/ja/about/info.rst
+++ b/docs/sphinx/ja/about/info.rst
@@ -20,6 +20,7 @@ TeNeS は以下のメンバーで開発しています。
 バージョン履歴
 ==================
 
+- ver. 2.1.0: 2024-02-28 にリリース。
 - ver. 2.0.0: 2023-11-17 にリリース。
 - ver. 2.0-beta: 2023-10-25 にリリース。
 - ver. 1.3.4: 2023-09-13 にリリース。