Kapacitor 1.6.4 has been released with several security-related improvements, including support for SASL-based authentication when integrating with Kafka, deprecation of weak ciphers such as DES and RC4, and removal of support for outdated TLS versions like 1.0 and 1.1. The update also includes fixes and enhancements not explicitly mentioned in the release notes. Users can obtain the latest version from the InfluxDB downloads page and report any issues or questions to the InfluxDB Community Slack channel or GitHub repository.