Selenium 4.49 Released!

Today we’re happy to announce that Selenium 4.49 has been released!

By Diego Molina @diemol | Wednesday, September 09, 2026

Selenium 4.49 Released

BiDi .NET closed out a run of BiDi wire-format bugs (missing DTO fields, mismatched proxy, realm, and NamespaceUri JSON property names, an oversized command-descriptor allocation) and gained browsing context screencast support; Python now raises typed WebDriver errors for BiDi wire error codes and runs its BiDi suite against the Grid server; JavaScript, Python, and Ruby now derive BiDi field names and enum value types directly from the shared schema.
[Grid] Fixed a 500 error when downloading a file whose name contains spaces.
[Java] Removed the deprecated GET /session/{sessionId}/se/files/{fileName} endpoint, and jars now ship with LICENSE/NOTICE files and smaller published javadocs.
[Rust] Fixed Selenium Manager’s Windows architecture detection under WOW64, and added Chrome arm64-on-Linux support.
[Python] Cleaned up typing across the codebase (untyped decorators, unreachable mypy warnings) and removed stale xfail markers.
[Build & Infra] Continued hardening the release and Selenium Manager build pipeline: native Linux builds, a pinned Rust toolchain, prebuilt Linux arm64 binaries in every binding, and a daily job to keep the pinned CDDL specs current.

Removed the deprecated GET /session/{sessionId}/se/files/{fileName} endpoint.
Jars now include LICENSE and NOTICE files, and published javadoc jars are smaller.
Removed a try/catch around opening a new window, and dropped a “best guess” URI encoding fallback.

Raised typed WebDriver errors for BiDi wire error codes.
Ran the BiDi test suite against the Grid server, and fixed flaky BiDi input tests that raced the page’s autofocus.
Added BiDi upload tests that verify files actually reach the server.
Enabled mypy’s disallow_untyped_decorators and fixed unreachable-code warnings; removed stale xfail markers.
Wired print_pdf_tests.py into the browser test suites.
Adopted the worthwhile ruff 0.16 rule families.

Fixed several BiDi DTO issues: missing fields, mismatched proxy and NamespaceUri JSON property names, and realm-type enum serialization.
Avoided a massive allocation when building BiDi command descriptors.
Added browsing context screencast support.
Only embed the git revision in SourceLink metadata when stamping.

Capitalized non-Latin text in the getVisibleText atom (shared with Python).
Now derives BiDi field names and enum value types from the shared schema (shared with Python and Ruby).

Improved pre-release workflow ordering, and began tracking the generated BiDi schema.
Fixed Selenium Manager’s Windows architecture detection under WOW64, and added Chrome arm64-on-Linux support.
Added license and notice links to Selenium Manager’s help output.
Built Selenium Manager’s Linux binaries natively with a pinned Rust toolchain, ran Rust tests and built Selenium Manager from source on Windows, and shipped a prebuilt Linux arm64 binary in every binding.
Pinned the rules_rs zlib bootstrap to an immutable snapshot (with a Launchpad fallback), and bumped rules_rs to 0.0.108/0.0.109 and @llvm to 0.8.19.
Added a daily workflow to update the pinned CDDL specs, and a compact execution log for CI.
Populated the Linux Bazel cache from the gh-cache workflow instead of RBE.

fix: node-kubernetes liveness probe — tcpSocket instead of /readyz (#3210)
K8s: Replace external scaler jobScalingStrategy with includeOngoingSessions (#3218)
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.