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We are pleased to announce the general availablility of IBM Semeru Runtime, Open Edition v21.0.1. This Long Term Service (LTS) release is based on Eclipse OpenJ9 0.42 and OpenJDK jdk-21.0.1+12. Java 21 introduces new language features such as Virtual Threads, and contains previews for upcoming features such as Foreign Function and Memory API. The binaries are available on our standard distribution sites on Jan 11, 2024. With this release IBM Semeru Open Edition contains the latest CPU and security fixes from the OpenJDK Oct’23 update of Java 21.