# Apache Airflow 2.3.4 — Release & Upgrade Intelligence
- **Product:** Apache Airflow (https://airflow.apache.org)
- **Version:** 2.3.4
- **Released:** Aug 23, 2022
- **Impact Score:** 7/10
- **Breaking Changes:** Source flagged
- **Canonical Analysis:** https://changelogs.us/airflow/updates/2.3.4/

## Executive Summary (TL;DR)
Apache Airflow 2.3.4. Source highlight: Disable ``attrs`` state management on ``MappedOperator`` (#24772)

## Breaking Changes & Deprecations
- - Limit Flask to <2.3 in the wake of 2.2 breaking our tests (#25511)

## New Features
- Doc: Add hyperlinks to Github PRs for Release Notes (#24532)

## Bug Fixes
- Disable ``attrs`` state management on ``MappedOperator`` (#24772)
- Serialize ``pod_override`` to JSON before pickling ``executor_config`` (#24356)
- Fix ``pid`` check (#24636)
- Rotate session id during login (#25771)
- Fix mapped sensor with reschedule mode (#25594)
- Cache the custom secrets backend so the same instance gets re-used (#25556)