Legacy TLS Upgrades

On March 4th, 2020, Slack will end support for TLS versions 1.0 and 1.1. In advance of this, we will implement a 24-hour test deprecation on February 19th, 2020. If you don’t update your apps to use TLS 1.2, requests sent to any Slack endpoint will fail after March 4th, 2020. You can use this lookup tool to identify apps that still need to be updated to use TLS 1.2.

Please note that we are using a rolling window of 30 days to identify traffic from your apps that are using TLS 1.0 and 1.1. The list below will be updated once per day and therefore may be 24 hours old.

This is not an exhaustive list of all traffic. We strongly recommend testing all Slack apps and services to ensure you are fully compliant with the latest supported version of TLS.

To learn more about TLS, visit our Help Center. If your apps are affected by this change, learn how to update them from the API Changelog. If you have questions, please contact our Support team.

You'll need to sign in to your Slack account to view your legacy TLS protocol usage.

Last updated on: February 6th, 2023