The JRuby community is pleased to announce the release of JRuby 10.1.1.0. * Homepage: [https://www.jruby.org/](https://www.jruby.org/) * Download: [https://www.jruby.org/download](https://www.jruby.org/download) JRuby 10.1.1.x targets Ruby 4.0 compatibility. Thank you to our contributors this release, you help keep JRuby moving forward! [@chadlwilson], [@kares], [@katafrakt], [@sampokuokkanen], [@segiddins], [@shugo] Notable Changes --------------- ### Performance * Use [FastDoubleParser](https://github.com/wrandelshofer/FastDoubleParser) to improve performance of all string-to-double parsing. [#9150] * Only pack fixnum values for 16-bit signed by default, with optional 8-bit and 32-bit configs. [#9379] ### Standard Library * jruby-openssl updated to 0.16.2 with several CVE fixes from BouncyCastle. [#9386], [#9504], [#9539] * erb updated to 6.0.1.1 to address CVE-2026-41316. [#9388] ### Native Integration * Updated JRuby's native library backend with support for OpenBSD. [#9439] ### Java Integration * Optimized automatic interface implementation when calling Java with a block. [#5023] ### Packaging * Begin deprecating `jruby-complete` and `jruby-core` Maven artifacts. Prefer the `jruby` and `jruby-base` artifacts. [#9512] ### 57 Issues and PRs resolved for 10.1.1.0 https://www.jruby.org/2026/07/22/jruby-10-1-1-0.html *Charles Oliver Nutter* *Architect and Technologist* Headius Enterprises https://www.headius.com headius@headius.com