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4.0.9 release notes 

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## RabbitMQ 4.0.9
RabbitMQ `4.0.9` is a maintenance release in the `4.0.x` [release series](https://www.rabbitmq.com/release-information).
Starting June 1st, 2024, community support for this series will only be provided to [regularly contributing users](https://github.com/rabbitmq/rabbitmq-server/blob/main/COMMUNITY_SUPPORT.md) and those
who hold a valid [commercial support license](https://tanzu.vmware.com/rabbitmq/oss).
It is **strongly recommended** that you read [4.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.0.1)
in detail if upgrading from a version prior to `4.0.0`.
### Minimum Supported Erlang Version
This release requires Erlang 26 and supports Erlang versions up to `27.3.x`.
[RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/docs/which-erlang) has more details on
Erlang version requirements for RabbitMQ.
Nodes **will fail to start** on older Erlang releases.
## Changes Worth Mentioning
Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v4.0.x/release-notes).
### Management Plugin
#### Enhancements
* It is now possible to require authentication for the HTTP API reference page
accessible at `/api`:
```ini
management.require_auth_for_api_reference = true
```
GitHub issue: [#13715](https://github.com/rabbitmq/rabbitmq-server/pull/13715)
### Federation Plugin
#### Bug Fixes
* Federation status command and HTTP API endpoint could run into an exception.
GitHub issue: [#13711](https://github.com/rabbitmq/rabbitmq-server/pull/13711)
### AMQP 1.0 Erlang Client for RabbitMQ
#### Bug Fixes
* Concurrent queue declarations could fail with an exception.
GitHub issue: [#13732](https://github.com/rabbitmq/rabbitmq-server/pull/13732)
### Dependency Changes
* `osiris` was updated to [`1.8.7`](https://github.com/rabbitmq/osiris/releases)
* `khepri_mnesia_migration` was upgraded to [`0.7.2`](https://github.com/rabbitmq/khepri_mnesia_migration/releases)
## Source Code Archives
To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-4.0.9.tar.xz`
instead of the source tarball produced by GitHub.