# Apache Airflow 2.6.3 — Release & Upgrade Intelligence
- **Product:** Apache Airflow (https://airflow.apache.org)
- **Version:** 2.6.3
- **Released:** Jul 10, 2023
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/airflow/updates/2.6.3/

## Executive Summary (TL;DR)
Apache Airflow 2.6.3. Source highlight: Use linear time regular expressions (#32303)

## New Features
- Add explanation about tag creation and cleanup (#32406)
- Add information for users who ask for requirements (#32262)
- Add links to DAGRun / DAG / Task in Templates Reference (#32245)
- Add a note that we'll need to restart triggerer to reflect any trigger change (#32140)
- Added difference between Deferrable and Non-Deferrable Operators (#31840)
- Add comments explaining need for special "trigger end" log message (#31812)

## Bug Fixes
- Use linear time regular expressions (#32303)
- Fix triggerers alive check and add a new conf for triggerer heartbeat rate (#32123)
- Catch the exception that triggerer initialization failed (#31999)
- Hide sensitive values from extra in connection edit form (#32309)
- Sanitize ``DagRun.run_id`` and allow flexibility (#32293)
- Add triggerer canceled log (#31757)