diff --git a/README.md b/README.md
index a5d1b62..09e5f90 100644
--- a/README.md
+++ b/README.md
@@ -35,17 +35,14 @@
 **Zvec** is an open-source, in-process vector database — lightweight, lightning-fast, and designed to embed directly into applications. Battle-tested within Alibaba Group, it delivers production-grade, low-latency and scalable similarity search with minimal setup.
 
 > [!Important]
-> 🚀 **v0.3.1 (Apr 17, 2026)**
+> 🚀 **v0.4.0 (May 9, 2026)**
 >
-> - Relaxed collection path restrictions and improved Windows path handling.
+> - **Dart/Flutter SDK**: Published the official [zvec](https://github.com/zvec-ai/zvec-dart) Flutter package with FFI bindings. Supports Android (arm64-v8a) and iOS (arm64) — no manual native compilation required.
+> - **iOS Build Support**: Added support for building on iOS platforms, expanding cross-platform coverage.
+> - **Enlarged topK Limit**: Relaxed the upper bound on topK to support larger-scale recall scenarios.
+> - **Bug Fixes**: SQ8 quantizer recall drop; Windows path handling; sparse vector index ordering.
 >
-> 🚀 **v0.3.0 (April 3, 2026)**
->
-> - **New Platforms**: Initial **Windows (MSVC)** and **Android** support. Published official Windows **Python** and **Node.js** packages.
-> - **Efficiency**: **RabitQ** quantization and **CPU Auto-Dispatch** for optimized SIMD execution.
-> - **Ecosystem**: **C-API** for custom language bindings and **[MCP](https://github.com/zvec-ai/zvec-mcp-server) / [Skill](https://github.com/zvec-ai/zvec-agent-skills)** integration for AI Agents.
->
-> 👉 [Read the Release Notes](https://github.com/alibaba/zvec/releases/tag/v0.3.0) | [View Roadmap 📍](https://github.com/alibaba/zvec/issues/309)
+> 👉 [Read the Release Notes](https://github.com/alibaba/zvec/releases/tag/v0.4.0) | [View Roadmap 📍](https://github.com/alibaba/zvec/issues/309)
 
 ## 💫 Features
 
diff --git a/README_CN.md b/README_CN.md
index 6e9425b..90a773c 100644
--- a/README_CN.md
+++ b/README_CN.md
@@ -35,17 +35,14 @@
 **Zvec** 是一款开源的嵌入式(进程内)向量数据库 — 轻量、极速，可直接嵌入应用程序。以极简的配置提供生产级、低延迟、可扩展的向量检索能力。
 
 > [!IMPORTANT]
-> 🚀  **v0.3.1 （2026 年 4 月 17 日）**
+> 🚀  **v0.4.0（2026 年 5 月 9 日）**
 >
-> - 放宽 Collection 路径限制；改进 Windows 上的路径处理。
+> - **Dart/Flutter SDK**：发布官方 [zvec](https://github.com/zvec-ai/zvec-dart) Flutter 包，提供 Dart/Flutter FFI 绑定，支持 Android（arm64-v8a）和 iOS（arm64），无需手动编译原生库。
+> - **iOS 构建支持**：新增 iOS 平台构建支持，进一步扩展跨平台覆盖范围。
+> - **扩大 topK 上限**：放宽 topK 结果数量上限，支持更大规模的召回场景。
+> - **修复**：SQ8 量化器召回率下降问题；Windows 路径处理修复；稀疏向量索引顺序修复。
 >
-> 🚀  **v0.3.0 （2026 年 4 月 3 日）**
->
-> - **新平台支持**：支持 **Windows (MSVC)** 和 **Android**。发布了官方 Windows **Python** 和 **Node.js** 安装包。
-> - **性能优化**：集成 **RabitQ** 量化以及 **CPU 指令集自适应检测**，优化 SIMD 执行。
-> - **生态集成**：提供 **C-API** 用于多种编程语言绑定，以及 **[MCP](https://github.com/zvec-ai/zvec-mcp-server) / [Skill](https://github.com/zvec-ai/zvec-agent-skills)** 集成。
->
-> 👉 [查看更新日志](https://github.com/alibaba/zvec/releases/tag/v0.3.0) | [查看路线图 📍](https://github.com/alibaba/zvec/issues/309)
+> 👉 [查看更新日志](https://github.com/alibaba/zvec/releases/tag/v0.4.0) | [查看路线图 📍](https://github.com/alibaba/zvec/issues/309)
 
 ## 💫 核心特性