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RabbitMQ `3.11.23` is a maintenance release in the `3.11.x` [release series](https://www.rabbitmq.com/versions.html).
This release series [goes out of community support on Dec 31, 2023](https://rabbitmq.com/versions.html).
Please refer to the upgrade section from [v3.11.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.11.0)
if upgrading from a version prior to 3.11.0.
This release requires Erlang 25 and supports Erlang versions up to `25.3.x`.
[RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/which-erlang.html) has more details on
Erlang version requirements for RabbitMQ.
### Minimum Supported Erlang Version
As of 3.11.0, RabbitMQ requires Erlang 25. Nodes **will fail to start** on older Erlang releases.
Erlang 25 as our new baseline means much improved performance on ARM64 architectures, [profiling with flame graphs](https://blog.rabbitmq.com/posts/2022/05/flame-graphs/)
across all architectures, and the most recent TLS 1.3 implementation available to all RabbitMQ 3.11 users.
## Changes Worth Mentioning
Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.11.x/release-notes).
### Core Server
#### Bug Fixes
* High consumer churn with reused consumer tag on quorum queues could result in some messages not being delivered
after a period of time.
This did not affect environments where consumer churn does not exist or where it does but consumer tags vary.
GitHub issue: [#9164](https://github.com/rabbitmq/rabbitmq-server/pull/9164)
* Three environment variables, `LOG_BASE`, `MNESIA_BASE`, `CONFIG_FILE`, were not picked up when set in
`rabbitmq-env-conf.bat` on Windows.
GitHub issue: [#9308](https://github.com/rabbitmq/rabbitmq-server/pull/9308)
* Avoids a potential exception when autoheal partition handling process was initiated.
GitHub issue: [#9223](https://github.com/rabbitmq/rabbitmq-server/pull/9223)
## Dependency Upgrades
* `osiris` was upgraded to [`1.6.4`](https://github.com/rabbitmq/osiris/tags)
## Source Code Archives
To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.11.23.tar.xz`
instead of the source tarball produced by GitHub.
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