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‎website_and_docs/content/blog/2025/selenium-4-39-released.md‎

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---
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title: "Selenium 4.39 Released!"
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linkTitle: "Selenium 4.39 Released!"
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date: 2025-12-06
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tags: [ "selenium" ]
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categories: [ "releases" ]
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author: Diego Molina [@diemol](https://www.diemol.com)
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images:
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- "/images/blog/2025/selenium_4.39.jpg"
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description: >
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Today we're happy to announce that Selenium 4.39 has been released!
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---
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We’re excited to announce the release of **Selenium 4.39** for JavaScript, Ruby, Python, .NET, Java
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and the Grid! 🎉
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Links to all assets can be found on our [downloads page][downloads].
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---
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# Selenium 4.39 Released
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Selenium 4.39 is a feature-rich release with numerous improvements across the board. It brings
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enhancements to BiDi across Java, Python, and .NET, more emulation commands, major updates to
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Dynamic Grid behavior, and continuous work on JSpecify annotations. It also includes docstring
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cleanups, test infra upgrades, and build system optimizations.
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---
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## Highlights
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- **Chrome DevTools support** is now: v143, v142, and v141.
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- **BiDi Enhancements Across Languages**: New emulation and download behavior commands for Java, Python, and .NET.
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- **Dynamic Grid Improvements**: Better container handling, new labels, and minimum Docker API version enforcement.
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- **Docstring and Type Hinting**: Continued work on Python docstrings using Google style and improving type hints.
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- **JSpecify Coverage in Java**: Many new annotations for type-safety and better tooling support.
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- **Build & CI Enhancements**: Optimized workflows, Bazel module updates, and CI improvements across languages.
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---
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## Language-specific Changes
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### Java
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- **BiDi**:
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- Support for:
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- `emulation.setTimezoneOverride`
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- `emulation.setScriptingEnabled`
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- `emulation.setUserAgentOverride`
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- `browser.setDownloadBehavior`
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- `browsingContext.setViewport(null, null)`
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- Refactored request interception tests with CORS handling.
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- **JSpecify annotations**:
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- `CommandCodec`, `CommandInfo`, `CommandPayload`, `Color`, `ChromiumDriver`, and more.
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- **Other**:
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- Prevent logging debug logs at `INFO` level.
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- Fixes for `PrintOptions.setPageRanges`, ClassCastException, and Chrome tests on Windows.
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- Improvements to exception handling and collection simplification.
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---
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### Python
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- **BiDi**:
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- Added:
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- `set_locale_override`
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- `set_scripting_enabled`
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- `set_screen_orientation_override`
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- `set_download_behavior`
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- `set_user_agent_override`
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- Viewport reset command
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- Enabled download event tests for Firefox.
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- **Documentation & Type Hints**:
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- Full docstring conversion to Google format.
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- Removed `noqa` markers, improved type annotations with union syntax.
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- **Dev/Tooling**:
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- Bumped `pytest`, `ruff`, `mypy`, and `urllib3`.
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- WebSocket improvements (daemon threads).
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- Test reuse and performance improvements.
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---
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### .NET
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- **BiDi**:
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- Improved event subscription and emulation module support.
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- Better JSON (de)serialization contexts per module.
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- Viewport reset, record equality, hydration, and type unification improvements.
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- Added Permissions module.
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- **General**:
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- Migrated solution to `.slnx`.
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- Removed obsolete dependencies (`Newtonsoft.Json`, `FtpProxy`).
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- Syntax highlighting improvements for JS strings.
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- Updated build tools (`paket`, `rules_dotnet`).
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---
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### Ruby
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- Fixed flaky `devtools_spec.rb`.
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- Minor BiDi updates.
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---
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### Rust (Selenium Manager)
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- Bazel migration of `rules_rust`.
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---
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## Grid
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- Minimum Docker API 1.44 support.
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- Improved:
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- Session ID handling
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- Container labels
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- Compose stack grouping
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- Docker client logic
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- Tracking `SessionRemovalInfo` and improved session map cleanup.
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---
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## Tooling & CI
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- Cancel redundant CI runs.
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- Mirror file workflow fixes and pagination.
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- Bazel build improvements.
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---
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### 🐳 Docker Selenium
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- [ci] Use test public site when test run via relay session to cloud
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- K8s: Remove triggerMetadata with empty value to prevent Unmatched input property from KEDA checks (#3005)
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- K8s: Expose config session request timeout in Helm chart values (#3006)
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- chore(deps): update helm release kube-prometheus-stack to v79 (#3007)
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- [See all changes](https://github.com/SeleniumHQ/docker-selenium/releases)
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<br>
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We thank all our contributors for their incredible efforts in making Selenium better with every
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release. ❤️
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For a detailed look at all changes, check out
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the [release notes](https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.39.0).
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<br>
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## Contributors
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**Special shout-out to everyone who helped the Selenium Team get this release out!**
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### [Selenium](https://github.com/SeleniumHQ/selenium)
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<div class="d-flex justify-content-center">
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<div class="col-11 p-4 bg-transparent">
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<div class="row justify-content-center">
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{{< gh-user "https://api.github.com/users/giulong" >}}
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{{< gh-user "https://api.github.com/users/iampopovich" >}}
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{{< gh-user "https://api.github.com/users/spencerarq" >}}
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</div>
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</div>
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</div>
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### [Selenium Docs & Website](https://github.com/SeleniumHQ/seleniumhq.github.io)
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<div class="row justify-content-center">
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<div class="col-11 p-4 bg-transparent">
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<div class="row justify-content-center">
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{{< gh-user "https://api.github.com/users/DNotNice" >}}
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{{< gh-user "https://api.github.com/users/JacekSzwed" >}}
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{{< gh-user "https://api.github.com/users/alaahong" >}}
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{{< gh-user "https://api.github.com/users/janetmoreno" >}}
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{{< gh-user "https://api.github.com/users/kathyrollo" >}}
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{{< gh-user "https://api.github.com/users/rushixdd" >}}
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</div>
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</div>
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</div>
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### [Docker Selenium](https://github.com/SeleniumHQ/docker-selenium)
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<div class="row justify-content-center">
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<div class="col-11 p-4 bg-transparent">
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<div class="row justify-content-center">
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{{< gh-user "https://api.github.com/users/visit1985" >}}
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</div>
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</div>
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</div>
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### [Selenium Team Members][team]
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**Thanks as well to all the team members who contributed to this release:**
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<div class="row justify-content-center">
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<div class="col-11 p-4 bg-transparent">
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<div class="row justify-content-center">
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{{< gh-user "https://api.github.com/users/aguspe" >}}
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{{< gh-user "https://api.github.com/users/asolntsev" >}}
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{{< gh-user "https://api.github.com/users/AutomatedTester" >}}
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{{< gh-user "https://api.github.com/users/bonigarcia" >}}
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{{< gh-user "https://api.github.com/users/cgoldberg" >}}
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{{< gh-user "https://api.github.com/users/diemol" >}}
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{{< gh-user "https://api.github.com/users/harsha509" >}}
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{{< gh-user "https://api.github.com/users/joerg1985" >}}
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{{< gh-user "https://api.github.com/users/nvborisenko" >}}
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{{< gh-user "https://api.github.com/users/p0deje" >}}
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{{< gh-user "https://api.github.com/users/pujagani" >}}
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{{< gh-user "https://api.github.com/users/RenderMichael" >}}
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{{< gh-user "https://api.github.com/users/shbenzer" >}}
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{{< gh-user "https://api.github.com/users/shs96c" >}}
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{{< gh-user "https://api.github.com/users/titusfortner" >}}
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{{< gh-user "https://api.github.com/users/VietND96" >}}
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</div>
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</div>
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</div>
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Stay tuned for updates by following SeleniumHQ on:
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- [Mastodon](https://mastodon.social/@[email protected])
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- [BlueSky](https://bsky.app/profile/seleniumconf.bsky.social)
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- [LinkedIn](https://www.linkedin.com/company/selenium/)
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- [Selenium Community YouTube Channel](https://www.youtube.com/@SeleniumHQProject/streams)
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- [X (Formerly Twitter)](https://twitter.com/seleniumhq)
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Happy automating!
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[downloads]: /downloads
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[bindings]: /downloads#bindings
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[team]: /project/structure
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[BiDi]: https://github.com/w3c/webdriver-bidi

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