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