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Ruby 4.0.0 was released on December 25, 2025.
This was a special release to celebrate Ruby's 30th anniversary. Here are the key highlights:
| Feature | Description |
|---|---|
| Ruby Box | A new experimental feature for separating definitions (isolates monkey patches, global/class variables, etc.) |
| ZJIT | A new Just-In-Time compiler for improved performance |
| Release Date | December 25, 2025 |
Sources:
Note: Ruby 4.0 is a major release but doesn't follow strict semantic versioning—Matz (Ruby's creator) increases the major version when changes impress him, rather than for breaking changes.