Selenium 4.40 Released!

We’re excited to announce the release of Selenium 4.40 for JavaScript, Ruby, Python, .NET, Java and the Grid! 🎉

Links to all assets can be found on our downloads page.

Selenium 4.40 Released

✨ Highlights

• Chrome DevTools support is now: v144, v143, and v142.
• [Java] Expanded BiDi support: setScreenOrientationOverride, setNetworkConditions, and command return type changes.
• [Python] Introduced LocalWebDriver base class, improved docstring formatting and typing, removed deprecated code.
• [Ruby] Better test synchronization, clearer BiDi API boundaries, and internal improvements.
• [DotNet] BiDi improvements in Input, Emulation, and buffer pooling logic.
• [Grid] Improved dynamic Grid container handling, better concurrent session handling, and race condition fixes.
• [Build] Bazel-based documentation and release automation improvements across all bindings.

📦 Notable Changes

Java

• Added support for new BiDi emulation and network commands.
• Deprecated unused logging and Guava collections.
• Improved test infrastructure and flaky test fixes.
• Improved Grid file upload, JSON parsing, and error handling.
• Automatically save screenshots and page sources on failure.

Python

• Added LocalWebDriver base class.
• Removed deprecated FirefoxBinary and FTP proxy support.
• Improved linting and typing with ruff and mypy.
• Better grid test integration and SE_DEBUG logging.

Ruby

• Improved error handling and synchronization for socket interactions.
• Marked BiDi internals as private.
• Fixed various flaky test issues.

.NET

• Support for SetScreenSettingsOverrideAsync, FileDialogOpened, and input module exposure.
• Improved memory usage and buffer reuse in BiDi communication.
• Removed obsolete or unstable APIs.

Grid

• Smarter container naming and label handling in Dynamic Grid.
• Race condition and concurrent session handling improvements.

Build & Infra

• All bindings now support rerun on test failures.
• Improved CI speed, clarity, and isolation.
• Build/test infra modernized with Bazel rules and doc generation.

🐳 Docker Selenium

• Docker: update video_graphQLQuery shell script to python (#3002)
• Update ubuntu:noble Docker digest to cd1dba6 (#3063)
• Update list new environment variables (#3062)
• See all changes

We thank all our contributors for their incredible efforts in making Selenium better with every release. ❤️

For a detailed look at all changes, check out the release notes.

Contributors

Special shout-out to everyone who helped the Selenium Team get this release out!

Selenium

Michal Zyndul

@mzyndul

Selenium Docs & Website

ian zhang

@alaahong

Docker Selenium

AvivGuiser

@KyriosGN0

Selenium Team Members

Thanks as well to all the team members who contributed to this release:

Augustin Gottlieb

@aguspe

Andrei Solntsev

@asolntsev

David Burns

@AutomatedTester

Boni García

@bonigarcia

Corey Goldberg

@cgoldberg

Diego Molina

@diemol

Sri Harsha

@harsha509

@joerg1985

Nikolay Borisenko

@nvborisenko

Alex Rodionov

@p0deje

Puja Jagani

@pujagani

Michael Render

@RenderMichael

Simon Benzer

@shbenzer

Simon Mavi Stewart

@shs96c

Titus Fortner

@titusfortner

Viet Nguyen Duc

@VietND96

Stay tuned for updates by following SeleniumHQ on:

• Mastodon
• BlueSky
• LinkedIn
• Selenium Community YouTube Channel
• X (Formerly Twitter)

Happy automating!

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