diff --git a/CHANGELOG.md b/CHANGELOG.md
index 693106e..84e608a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,30 @@ All notable changes to this project will be 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).
 
+## [1.3.0] - 2025-12-15
+
+### Changed
+- **Express 5**: Migrated gateway from Express 4 to Express 5
+- **ESLint 9**: Migrated to ESLint 9 flat config with typescript-eslint 8
+- **Async Error Handling**: Route handlers now use `throw` pattern instead of try/catch blocks
+- Added `HttpError` class and `httpError` factory functions for cleaner error handling
+
+### Updated Dependencies
+- `express`: 4.18.2 → 5.0.0
+- `helmet`: 7.1.0 → 8.0.0
+- `@types/express`: 4.17.21 → 5.0.0
+- `eslint`: 8.56.0 → 9.0.0
+- `typescript-eslint`: 7.0.0 → 8.0.0
+- `@atproto/oauth-client-node`: 0.1.0 → 0.3.0
+- `better-sqlite3`: 11.0.0 → 11.6.0
+- `typescript`: 5.3.0 → 5.7.0
+- `vitest`: 1.0.0 → 2.0.0
+- `@types/node`: 20.10.0 → 22.0.0
+
+### Improved
+- Enabled `projectService` in typescript-eslint for better type-aware linting performance
+- Simplified error handling code (~150 lines of boilerplate removed)
+
 ## [1.2.0] - 2025-12-14
 
 ### Added
@@ -45,5 +69,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Input validation and sanitization
 - Rate limiting on all endpoints
 
+[1.3.0]: https://github.com/Cache8063/atauth/compare/v1.2.0...v1.3.0
 [1.2.0]: https://github.com/Cache8063/atauth/compare/v1.0.0...v1.2.0
 [1.0.0]: https://github.com/Cache8063/atauth/releases/tag/v1.0.0
diff --git a/Cargo.toml b/Cargo.toml
index daef28a..5a9f226 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "atauth"
-version = "1.2.0"
+version = "1.3.0"
 edition = "2021"
 authors = ["ATAuth Contributors"]
 description = "Generic AT Protocol (Bluesky) authentication library for Rust applications"
diff --git a/gateway/package.json b/gateway/package.json
index 83da66d..f20f3ea 100644
--- a/gateway/package.json
+++ b/gateway/package.json
@@ -1,6 +1,6 @@
 {
   "name": "atauth-gateway",
-  "version": "1.2.0",
+  "version": "1.3.0",
   "description": "AT Protocol OAuth gateway for application authentication",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/ts/package.json b/ts/package.json
index 80fa0c1..ef26017 100644
--- a/ts/package.json
+++ b/ts/package.json
@@ -1,6 +1,6 @@
 {
   "name": "atauth",
-  "version": "1.2.0",
+  "version": "1.3.0",
   "description": "AT Protocol (Bluesky) authentication utilities for TypeScript/JavaScript",
   "main": "dist/index.js",
   "module": "dist/index.mjs",