--- title: Support for Istio 1.1 has ended subtitle: Support Announcement description: Istio 1.1 end of life announcement. publishdate: 2019-10-21 aliases: - /news/2019/announcing-1.1-eol-final --- As [previously announced](/news/support/announcing-1.1-eol/), support for Istio 1.1 has now officially ended. Since we learned of the security vulnerability [behind our October 8th security release](/news/security/istio-security-2019-005) while still barely within the 1.1 support period, we decided to extend the 1.1 support period beyond the original announcement and release [1.1.16](/news/releases/1.1.x/announcing-1.1.16). Then we discovered a [bug in HTTP header size calculation](https://github.com/istio/istio/issues/17735) was introduced by the security release, so we decided to release a fix in one last [1.1.17](/news/releases/1.1.x/announcing-1.1.17) release before closing out the 1.1 series for good. At this point we will no longer back-port fixes for security issues and critical bugs to 1.1, so we heartily encourage you to upgrade to the latest version of Istio ({{}}) if you haven't already.