diff --git a/CHANGELOG.md b/CHANGELOG.md
index 495fa56..0ecb18c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+## [4.0.9] - 2025-05-09
+### Fixed
+- **MCP Installer:** Addressed several critical bugs in the MCP installation and update process to improve reliability.
+  - Corrected the npm package name for the `morphllm` server in `setup/components/mcp.py`.
+  - Implemented a custom installation method for the `serena` server using `uv`, as it is not an npm package.
+  - Resolved a `NameError` in the `update` command within `setup/cli/commands/install.py`.
+  - Patched a recurring "Unknown component: core" error by ensuring the component registry is initialized only once.
+  - Added the `claude` CLI as a formal prerequisite for MCP server management, which was previously undocumented.
 
 ## [4.0.8] - 2025-01-23
 
@@ -136,4 +144,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **Commands**: analyze, build, cleanup, design, document, estimate, explain, git, improve, index, load, spawn, task, test, troubleshoot
 - **Personas**: architect, frontend, backend, analyzer, security, mentor, refactorer, performance, qa, devops, scribe
 - **MCP Servers**: Official library documentation, complex analysis, UI components, browser automation
-- **Installation**: Quick, minimal, and developer profiles with component selection
\ No newline at end of file
+- **Installation**: Quick, minimal, and developer profiles with component selection