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## RabbitMQ 3.7.23
RabbitMQ `3.7.23` is a maintenance release.
RabbitMQ `3.7.x` series is supported [through March 2020](https://www.rabbitmq.com/versions.html).
### Erlang/OTP Compatibility Notes
Per the new Erlang version support policy in effect starting with January 2019,
this release [**no longer supports Erlang/OTP 20.3**](https://groups.google.com/d/msg/rabbitmq-users/G4UJ9zbIYHs/qCeyjkjyCQAJ).
Make sure a [supported Erlang version](https://www.rabbitmq.com/which-erlang.html) is used before upgrading.
[Provisioning Latest Erlang Releases](https://www.rabbitmq.com/which-erlang.html#erlang-repositories) explains
what package repositories and tools can be used to provision latest patch versions of Erlang `21.3.x` and `22.x`.
### Compatibility Notes
#### Upgrading to Erlang 21.x or Later Versions
When upgrading to this release **and upgrading Erlang to 21.x or later** at the same time, extra care has to be taken.
Since CLI tools from RabbitMQ releases older than 3.7.7 will fail on Erlang 21 or later,
RabbitMQ **must be upgraded before Erlang**.
#### Upgrade Doc Guides and Change Log
See [3.7.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.7.0) upgrade
and compatibility notes first if upgrading from an earlier release.
See the [Upgrading guide](https://www.rabbitmq.com/upgrade.html) for general documentation on upgrades
and [RabbitMQ change log](https://www.rabbitmq.com/changelog.html) for release notes of other releases.
### Getting Help
Any questions about this release, upgrades or RabbitMQ in general are welcome on the
[RabbitMQ mailing list](https://groups.google.com/forum/#!forum/rabbitmq-users).
## Changes
### MQTT Plugin
#### Enhancements
* Throughput improvements ranging from 14 to 60 percent depending on workload.
GitHub issue: [rabbitmq/rabbitmq-server#2168](https://github.com/rabbitmq/rabbitmq-server/issues/2168)
### AMQP 1.0 Plugin
#### Enhancements
* Throughput improvements.
GitHub issue: [rabbitmq/rabbitmq-server#2168](https://github.com/rabbitmq/rabbitmq-server/issues/2168)
### STOMP Plugin
#### Enhancements
* Throughput improvements.
GitHub issue: [rabbitmq/rabbitmq-server#2168](https://github.com/rabbitmq/rabbitmq-server/issues/2168)
### Web STOMP Plugin
#### Enhancements
* Clients now can authenticate using an x.509 (TLS) certificate.
GitHub issue: [rabbitmq/rabbitmq-web-stomp#116](https://github.com/rabbitmq/rabbitmq-web-stomp/issues/116)
## Source code archives
**Warning**: The source code archive provided by GitHub only contains the source of the broker,
not the plugins or the client libraries. Please download the archive named `rabbitmq-server-3.7.23.tar.xz`.
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