diff --git a/CHANGELOG.md b/CHANGELOG.md
index 984205f..7bca383 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,24 +1,30 @@
 # Change Log
 
+## [v2.1.0](https://github.com/KoyanagiHitoshi/AtCoder-Classification/releases/tag/v2.1.0) / 2023-08-27
+
+* [#10](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/10) add code
+* [#10](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/10) update README.md 
+* [#10](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/10) update CHANGELOG.md
+
 ## [v2.0.0](https://github.com/KoyanagiHitoshi/AtCoder-Classification/releases/tag/v2.0.0) / 2023-04-23
 
-* [#9](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/9) update CHANGELOG.md
-* [#9](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/9) update README.md 
+* [#9](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/9) change repository name (AtCoder ⇒ AtCoder-Classification)
 * [#9](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/9) update LICENSE
-* [#9](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/9) change repository name
+* [#9](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/9) update README.md 
+* [#9](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/9) update CHANGELOG.md
 
 ## [v1.3.0](https://github.com/KoyanagiHitoshi/AtCoder-Classification/releases/tag/v1.3.0) / 2022-04-03
 
-* [#8](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/8) update CHANGELOG.md
-* [#8](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/8) update README.md 
 * [#8](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/8) add code
+* [#8](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/8) update README.md 
+* [#8](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/8) update CHANGELOG.md
 
 ## [v1.2.1](https://github.com/KoyanagiHitoshi/AtCoder-Classification/releases/tag/v1.2.1) / 2020-04-13
 
-* [#7](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/7) update CHANGELOG.md 
+* [#7](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/7) add code
 * [#7](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/7) update LICENSE
 * [#7](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/7) update README.md 
-* [#7](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/7) add code
+* [#7](https://github.com/KoyanagiHitoshi/AtCoder-Classification/pull/7) update CHANGELOG.md 
 
 ## [v1.2.0](https://github.com/KoyanagiHitoshi/AtCoder-Classification/releases/tag/v1.2.0) / 2020-04-08
 
@@ -33,12 +39,12 @@
 
 ## v1.1.0 / 2020-03-31
 
-* first commit LICENSE
-* first commit new code
 * delete old code
+* first commit new code
+* first commit LICENSE
 
 ## v1.0.0 / 2019-02-26
 
-* first commit README.md
-* first commit code
 * create repository
+* first commit README.md
+* first commit code
\ No newline at end of file