diff --git a/pyproject.toml b/pyproject.toml
index 4e27fd7..eaa04af 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "bk-crypto-python-sdk"
-version = "3.0.0"
+version = "4.0.0"
 description = "bk-crypto-python-sdk is a lightweight cryptography toolkit for Python applications based on Cryptodome / tongsuopy and other encryption libraries."
 authors = ["TencentBlueKing <contactus_bk@tencent.com>"]
 readme = "readme.md"
diff --git a/release.md b/release.md
index 6c69211..351f03f 100644
--- a/release.md
+++ b/release.md
@@ -1,6 +1,6 @@
 **# 版本日志
 
-## Unreleased
+## 4.0.0 - 2026-08-27
 
 ### Feature