# Apache Airflow 3.0.4 — Release & Upgrade Intelligence
- **Product:** Apache Airflow (https://airflow.apache.org)
- **Version:** 3.0.4
- **Released:** Aug 08, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/airflow/updates/3.0.4/

## Executive Summary (TL;DR)
Apache Airflow 3.0.4. Source highlight: 📦 PyPI: https://pypi.org/project/apache-airflow/3.0.4/

## New Features
- Add deprecation notice for using Connection from models in favor of SDK approach (#53594) (#53621)
- Add user-facing documentation for running separate Task Execution API server (#53789) (#53794)
- Add documentation for self-signed certificate configuration (#53788) (#53792)

## Bug Fixes
- Fix scheduler heartbeat timeout failures with intermittent ``DetachedInstanceError`` crashes (#53838) (#53858)
- Fix connection editing where sensitive fields like passwords and extras were lost when updating connections (#53943) (#53973)
- Fix BaseOperator ``on_kill`` functionality not working when tasks are killed externally in TaskSDK (#53718) (#53832)
- Fix TaskInstance notes not refreshing automatically without manual page refresh (#53307) (#54025)
- Fix invalid execution API URLs causing failures in task supervisor (#53082) (#53518)
- Fix task failure callbacks not running on DAG Processor when tasks are externally killed (#53058) (#53143)