diff --git a/Cargo.toml b/Cargo.toml
index d99cf50..37600e3 100755
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "sol-trade-sdk"
-version = "4.0.1"
+version = "4.0.2"
 edition = "2021"
 authors = [
     "William <byteblock6@gmail.com>",
diff --git a/README.md b/README.md
index e4a8724..7686530 100644
--- a/README.md
+++ b/README.md
@@ -90,14 +90,14 @@ Add the dependency to your `Cargo.toml`:
 
 ```toml
 # Add to your Cargo.toml
-sol-trade-sdk = { path = "./sol-trade-sdk", version = "4.0.1" }
+sol-trade-sdk = { path = "./sol-trade-sdk", version = "4.0.2" }
 ```
 
 ### Use crates.io
 
 ```toml
 # Add to your Cargo.toml
-sol-trade-sdk = "4.0.1"
+sol-trade-sdk = "4.0.2"
 ```
 
 ## 🛠️ Usage Examples
diff --git a/README_CN.md b/README_CN.md
index 6060766..58397f3 100755
--- a/README_CN.md
+++ b/README_CN.md
@@ -90,14 +90,14 @@ git clone https://github.com/0xfnzero/sol-trade-sdk
 
 ```toml
 # 添加到您的 Cargo.toml
-sol-trade-sdk = { path = "./sol-trade-sdk", version = "4.0.1" }
+sol-trade-sdk = { path = "./sol-trade-sdk", version = "4.0.2" }
 ```
 
 ### 使用 crates.io
 
 ```toml
 # 添加到您的 Cargo.toml
-sol-trade-sdk = "4.0.1"
+sol-trade-sdk = "4.0.2"
 ```
 
 ## 🛠️ 使用示例
diff --git a/RELEASE_v4.0.2.md b/RELEASE_v4.0.2.md
new file mode 100644
index 0000000..d81aa12
--- /dev/null
+++ b/RELEASE_v4.0.2.md
@@ -0,0 +1,19 @@
+## sol-trade-sdk v4.0.2
+
+This release focuses on QUIC reliability and low-latency submission stability for Astralane.
+
+### Highlights
+
+- Fixed Astralane QUIC address-family mismatch that could produce `invalid remote address` when DNS returned IPv6 first and local endpoint was IPv4-only.
+- Added remote-family-aware local QUIC bind selection:
+  - IPv4 remote -> bind `0.0.0.0:0`
+  - IPv6 remote -> bind `[::]:0`
+- Added Astralane direct-IP candidate support (official region IPs), with IPv4-first selection for better QUIC stability.
+- Added automatic endpoint failover and reconnect rotation across candidate addresses, reducing single-endpoint/DNS variance impact.
+- Kept existing SDK interfaces compatible while improving submit-path resiliency.
+
+### Also included from recent updates
+
+- BlockRazor gRPC endpoint fixes and gRPC default transport behavior improvements (v4.0.1).
+- SWQOS transport path hardening and Binary-Tx response handling improvements (v4.0.0).
+