diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6efd363d48..fca6ee352c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,10 +5,10 @@ All notable changes to DeerFlow are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [2.1.0] — 2026-09-24
 
 This section accumulates work toward the **2.1.0** milestone
-([milestone 2](https://github.com/bytedance/deer-flow/milestone/2)).
+([2.1.0](https://github.com/bytedance/deer-flow/milestone/2)).
 This release closes that milestone with **772 merged pull requests**.
 
 ### ⚠ Breaking changes
diff --git a/CHANGELOG_zh.md b/CHANGELOG_zh.md
index b44e78b267..6fce8934f1 100644
--- a/CHANGELOG_zh.md
+++ b/CHANGELOG_zh.md
@@ -7,9 +7,9 @@
 
 [English](./CHANGELOG.md) | 中文
 
-## [未发布]
+## [2.1.0] — 2026-09-24
 
-本节累积面向 **2.1.0** 里程碑（[里程碑 2](https://github.com/bytedance/deer-flow/milestone/2)）的工作。
+本节累积面向 [2.1.0](https://github.com/bytedance/deer-flow/milestone/2)）的工作。
 该里程碑随本次发布收尾，共合并 **772 个 pull request**。
 
 ### ⚠ 不兼容变更（Breaking Changes）