Selenium 4.36 Released!

Today we’re happy to announce that Selenium 4.36 has been released!

By Diego Molina @diemol | Thursday, September 18, 2025

Selenium 4.36 Released

Selenium 4.36 is out with updates across all language bindings and the Grid. This release focuses on expanding BiDi capabilities, improving developer experience through logging and debugging enhancements, and cleaning up deprecated code paths. It also includes dependency updates, new tests, and stability improvements.

🚩 Highlights

Chrome DevTools support is now: v140, v139, and v138.
Expanded BiDi Support:
- New events and modules added across Python, Java, .NET, and Ruby (e.g. downloadEnd, navigation, cookies, network collectors, WebExtensions).
Selenium Grid:
- Regression fix in request handling and better resource cleanup.
- Light/Dark Mode toggle added to Grid UI.
Developer Experience:
- Improved error messages and type annotations in Python.
- Better logging options across bindings, including Chrome and Safari support.
- Cleaner structure for BiDi internals in .NET.

🔧 Language-specific Updates

Java

Extended BiDi support:
- Added DownloadInfo, onNavigationFailed, and related test hooks.
Screenshot hooks added to WebDriverListener.
Unified and refactored Select class methods.
Fixed concurrency issue in Selenium Manager.
Improved resource handling and extended HttpCommandExecutor scope.
Added @JSpecify annotations to exception classes and drivers.
Fixed broken documentation links.

Python

BiDi:
- Added support for historyUpdated, navigate, and downloadEnd events.
- Added test for BiDi Data URL handling.
Logging:
- Enabled --enable-chrome-logs for Chrome to inherit browser I/O streams.
Better error handling:
- Clearer messages on selector issues (e.g. InvalidSelectorException for compound class names).
Refactors:
- Converted all relative imports to absolute.
- Updated example for DesiredCapabilities to use modern Options.
Fixed:
- Type annotations across multiple files.
- Proxy port handling in IPv6 environments.
Cleanups:
- Removed unused driver_instance from conftest.py.

.NET

BiDi:
- Support for network collectors, response body, and WebExtensions.
- Improved internal type safety, serialization, and navigation tracking.
- Introduced BaseNavigationInfo and removed obsolete logic.
Logging:
- Added SafariDriver logging toggle.
- Conditionally redirect browser output streams.
- Suppressed unwanted messages from drivers.
Infrastructure:
- Better support for older .NET Framework copying Selenium Manager.
- Fixed port discovery in IPv4-only environments.
Documentation:
- Fixed broken links in code and website.

Ruby

BiDi:
- Implemented browser module with user context methods.
- Support for getting client windows.
- Removed Chrome FedCM test guards (now fixed in Chrome).
Other:
- Updated unhandled_prompt_behavior to support hash syntax.
- Fixed unit tests and exception doc links.

JavaScript

Updated several dependencies:
- react, react-router-dom, material-ui, ws, and more.
BiDi-related fixes:
- Text transformation issue in atoms corrected (text-transform: capitalize).

Rust (Selenium Manager)

Now honors full browser version, even when only major version is installed.
Logs browser path even in offline mode.
Updated to Rust edition 2024 and bumped dependencies (rules_cc, rulest_rust, etc.).

🖥️ Selenium Grid

Fixed regression where requests were incorrectly rejected when nodes had capabilities but no free slots.
Improved resource handling:
- HttpClient is now closed properly after session teardown.
- Improved timeout handling between Router and Node.
Updated to Netty 4.2.4 for better network handling.
New UI Feature:
- Added Light/Dark mode toggle to Grid interface.

📚 Documentation & Internal Tooling

Fixed and updated:
- Broken API doc links
- CONTRIBUTING.md guidelines
- Linting and type annotations
Bumped:
- Python dev dependencies
- Setup scripts and GitHub Actions tooling

🐳 Docker Selenium

K8s: Switch image registry for Bitnami deps image in sub charts (#2960)
Docker: Fix regression SE_NODE_STEREOTYPE_EXTRA could not merge stereotypes (#2971)
Update ubuntu:noble Docker digest to 728785b (#2972)
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.