generated: '2026-08-26'
method: searched
source: >-
  https://github.com/SeleniumHQ/selenium/blob/trunk/AGENTS.md (compatibility invariant +
  deprecation policy), https://api.github.com/repos/SeleniumHQ/selenium/releases,
  https://www.selenium.dev/blog/ release announcements,
  https://www.selenium.dev/documentation/webdriver/troubleshooting/upgrade_to_selenium_4/,
  https://www.selenium.dev/documentation/legacy/, and
  https://www.selenium.dev/documentation/warnings/bidi-implementation/ — all read 2026-08-26
provider: Selenium
providerId: selenium
description: >-
  Versioning, deprecation and support posture for the Selenium project. Selenium ships software
  people run themselves; there is no vendor-operated service, so several fields that would carry an
  SLA or an uptime page for a SaaS provider are structurally not applicable here and are recorded
  as such rather than left blank.
versioning:
  scheme: MAJOR.MINOR.PATCH release train (explicitly NOT semver)
  current_version: 4.47.0
  released: '2026-08-10'
  in_url: false
  in_header: false
  note: >-
    AGENTS.md: "This project does not follow semantic versioning (semver)". The number is a
    coordinated release train — Java, Python, .NET, Ruby and JavaScript all published 4.47.0 within
    eight minutes of one another on 2026-08-10. The wire protocol itself is versioned by the W3C
    (WebDriver Level 2 / WebDriver BiDi), not by Selenium's release number, so a Selenium upgrade
    does not change the HTTP contract.
  compatibility_invariant: >-
    "Maintain API/ABI compatibility by default (users upgrade by changing only the version number);
    public functionality may be removed only after it has gone through the Deprecation policy."
deprecation:
  policy_published: true
  policy_url: https://github.com/SeleniumHQ/selenium/blob/trunk/AGENTS.md
  policy: >-
    Before removing public functionality, it must first be marked deprecated with a message pointing
    to the alternative. Language-specific AGENTS.md files carry the per-binding deprecation
    mechanism.
  sunset_header: false
  deprecation_header: false
  note: >-
    RFC 8594 Sunset/Deprecation headers are not used and would not apply — deprecation here is a
    source-level annotation in five language bindings, surfaced to the developer at compile time or
    as a runtime warning, not an HTTP response header. That is the correct mechanism for a client
    library, but it means an agent calling the wire protocol gets no deprecation signal at all.
  recent_deprecations:
    - item: FTP proxy support
      action: removed
      version: 4.47.0
      source: javascript/selenium-webdriver/CHANGES.md — "remove deprecated FTP proxy support (#17846)"
    - item: Invalid Firefox profile code
      action: deprecated
      version: 4.47.0
      source: javascript/selenium-webdriver/CHANGES.md — "deprecate invalid Firefox profile code (#17871)"
    - item: Chrome DevTools Protocol (CDP) integration
      action: legacy
      status: superseded by WebDriver BiDi
      source: >-
        llms.txt — "WebDriver BiDi is the supported route for events, network interception, and
        console log access. The Chrome DevTools Protocol integration is legacy."
        See also https://www.selenium.dev/documentation/warnings/bidi-implementation/
    - item: Desired Capabilities
      action: removed
      version: '4.0'
      replacement: Per-browser Options classes
      source: https://www.selenium.dev/documentation/webdriver/troubleshooting/upgrade_to_selenium_4/
    - item: JSON Wire Protocol (OSS dialect)
      action: removed
      version: '4.0'
      replacement: W3C WebDriver protocol
      source: https://www.selenium.dev/documentation/legacy/json_wire_protocol/
    - item: Third-party driver managers and manual driver paths
      action: discouraged
      replacement: Selenium Manager, bundled since 4.6
      source: >-
        llms.txt — "Selenium 4.6 and later include Selenium Manager... Do not set driver executable
        paths and do not use third-party driver managers."
release_cadence:
  observed: roughly monthly minor releases
  evidence:
    - {version: 4.47.0, date: '2026-08-10'}
    - {version: 4.46.0, date: '2026-07-11'}
    - {version: 4.45.0, date: '2026-06-16'}
    - {version: 4.44.0, date: '2026-05-12'}
    - {version: 4.43.0, date: '2026-04-10'}
    - {version: 4.42.0, date: '2026-04-09'}
    - {version: 4.41.0, date: '2026-02-20'}
  source: https://api.github.com/repos/SeleniumHQ/selenium/releases
  note: >-
    A `nightly` pre-release tag is also published continuously (last seen 2026-08-26). Every stable
    release gets a dated announcement post at https://www.selenium.dev/blog/.
status_page:
  present: false
  url: null
  note: >-
    No status page exists and none could. WebDriver, Grid and Selenium Manager all run on
    infrastructure the consumer owns; there is no Selenium-operated endpoint whose uptime could be
    reported. The nearest operational dependencies an agent should watch are the browser-vendor
    driver feeds Selenium Manager downloads from (Chrome for Testing, Mozilla, Microsoft), which the
    Selenium Manager docs call out as the known connectivity failure mode.
sla:
  published: false
  note: >-
    No SLA. Selenium is a volunteer open-source project under the Software Freedom Conservancy;
    support is community support (https://www.selenium.dev/support/), not a contracted service.
support:
  channels:
    - {type: docs, url: https://www.selenium.dev/support/}
    - {type: issues, url: https://github.com/SeleniumHQ/selenium/issues}
    - {type: chat, url: https://www.selenium.dev/support/, note: Slack and IRC, archived at SeleniumHQ/selenium-logs}
governance:
  url: https://www.selenium.dev/project/governance/
  structure_url: https://www.selenium.dev/project/structure/
  note: Project governance and structure are published, which is the open-source analogue of a vendor's trust posture.
deprecated_operations: []
deprecated_operations_note: >-
  None. No operation in openapi/ carries `deprecated: true`; the W3C endpoints captured there are
  all current in WebDriver Level 2.