Selenium 4.38 Released!

Today we’re happy to announce that Selenium 4.38 has been released!

By Diego Molina @diemol | Friday, October 24, 2025

Selenium 4.38 Released

Selenium 4.38 is a maintenance-focused release with improvements in code quality, documentation formatting, and test infrastructure. The update includes ongoing work on BiDi features, cleanup of deprecated code, and expansion of JSpecify annotations for better type safety in Java.

Highlights

Chrome DevTools support is now: v142, v141, and v140.
Java JSpecify Coverage Expanded: Dozens of additional classes annotated to improve null-safety and developer experience.
Python Docstring and BiDi Work: Switched to Google-style docstrings and added support for set_timezone_override in BiDi emulation.
Ruby Cleanup: Deprecated logging classes removed and RSpec linting applied.
Infrastructure & Docs: Test workflows cleaned up, doc update jobs fixed, and Travis cruft removed from builds.

Language-specific Changes

Java

JSpecify annotations added for:
- ExecuteMethod
- org.openqa.selenium.federatedcredential
- org.openqa.selenium.interactions
- org.openqa.selenium.net
- Credential, MBean
- ScriptKey, UnpinnedScriptKey
- FileDetector
- ExpectedCondition
- Response, SessionId, HttpSessionId
BiDi:
- New test added for the onHistoryUpdated event.

Python

BiDi:
- Added set_timezone_override command under emulation.
Documentation:
- Converted more docstrings to Google style.
- Removed use of :param: and :args: Sphinx directives.
Tooling:
- Bumped ruff formatter/linter version.

.NET

BiDi:
- Updated DTO property inclusion to avoid reliance on JsonInclude.

Ruby

BiDi test infra:
- Reduced number of BiDi-related test targets for better performance.
- Disabled dev/shm for Chrome/Edge tests on RBE.
Code cleanup:
- Removed deprecated logging classes.
- Applied rspec linter syntax updates.
- Fixed nil handling in network requests.
Build improvements:
- Improved local dev environment generation.

Rust (Selenium Manager)

Fixed browser version test for Edge.

Tooling & Infrastructure

Removed unused test_tag_filter.
Removed legacy Travis CI environment code (Java, Ruby).
Fixed documentation update workflows for both staging and main releases.

🐳 Docker Selenium

[ci] Use test public site when test run via relay session to cloud
K8s: Remove triggerMetadata with empty value to prevent Unmatched input property from KEDA checks (#3005)
K8s: Expose config session request timeout in Helm chart values (#3006)
chore(deps): update helm release kube-prometheus-stack to v79 (#3007)
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.