WebView2 Runtime Version 109 is more than just a routine update; it is a milestone in the modernization of the Windows ecosystem. By drawing a line in the sand regarding legacy OS support, Microsoft is pushing developers to modernize their platforms.

WebView2 allows developers to embed web content (HTML, CSS, and JavaScript) directly into native Windows applications. Because it uses the same Chromium engine as Microsoft Edge, it must periodically drop support for older operating systems that no longer receive security updates from Microsoft.

Microsoft recommends that any app not constrained by legacy OSes (the current stable channel as of 2025). For legacy‑bound apps, the only safe path is to isolate the WebView2 component from sensitive data and network access.

Here is everything you need to know about WebView2 Runtime Version 109.