I'm not sure that this is correct. io.js 1.4.1 just shipped with v8 version 4.1.0.21[0] which was released on 2/24/15[1]. Additionally, the post which you quo

I'm not sure that this is correct. io.js 1.4.1 just shipped with v8 version 4.1.0.21[0] which was released on 2/24/15[1]. Additionally, the post which you quoted specifically says that "4.1 -> Chrome 41" and "and every branch's support period is also the same (another ~6 weeks until the next Chrome version goes on the stable channel)." So this means that the branch is supported until Chrome 42 goes in to the stable channel. Though a case could be made that since 4.1.0.21 is tied to Chrome 41, which is still on the Beta channel, and "Our stability expectations are the same for every branch (once it starts shipping on Chrome stable, which is roughly 6 weeks after it's been created)" [0] - https://github.com/iojs/io.js/blob/v1.x/CHANGELOG.md https://github.com/iojs/io.js/blob/v1.x/CHANGELOG.md [1] - https://chromium.googlesource.com/v8/v8.git/+/4.1.0.21 https://chromium.googlesource.com/v8/v8.git/+/4.1.0.21