# Playwright v1.64.0 — Release & Upgrade Intelligence
- **Product:** Playwright (https://playwright.dev)
- **Version:** v1.64.0
- **Released:** Oct 07, 2026
- **Impact Score:** 7/10
- **Breaking Changes:** Source flagged
- **Canonical Analysis:** https://changelogs.us/playwright/updates/v1.64.0/

## Executive Summary (TL;DR)
Playwright v1.64.0. Source highlight: New page.webmcp and frame.webmcp give access to the tools that a page registers through the experimental WebMCP browser API, so you can test them like any other part of your app:

## Breaking Changes & Deprecations
- Breaking changes ⚠️ - `screen` property is now forwarded from the [device descriptors](https://playwright.dev/docs/emulation#devices). If you use `...devices['Desktop Chrome']` and alike, `window.screen` and media queries now see the emulated screen size. You can opt-out by explicitly setting `screen` to `undefined`:

## New Features
- New `lock` option in test.describe.configure() adds test locks to all tests in a file or a group: