HiveMQ 4.28.13 Maintenance Release

The HiveMQ team is pleased to announce the availability of HiveMQ 4.28.13.

This maintenance release for the 4.28 series includes the following improvements:

HiveMQ Enterprise MQTT Broker

• Optimized client connection handling to reduce memory consumption.
• Fixed an issue that could cause the loss of session replication data after a topology change.
• Fixed an issue where enqueued publishes sent with the retain flag were mistakenly classified as retained publishes from a topic during a stateful start. This fix ensures accurate accounting and prevents possible exceptions in subsequent message flows.
• Expanded the client queue state data provided in the diagnostic archive to improve debugging capabilities.

IMPORTANT: Java 21 will soon be required to run the HiveMQ Platform.

Since the HiveMQ 4.28 release in April 2024, Java 21 is recommended to run the HiveMQ Platform. For all HiveMQ versions released after April 2025, Java 21 will be required.

If you use the official HiveMQ container images, no action is required because these images have shipped with Java 21 since HiveMQ 4.28. If you do not run HiveMQ as a container, or you build your own container image, we recommend updating to Java 21 before the April 2025 deadline.

Have a great day, The HiveMQ Team