Slack

Category: communications

2 changes tracked

Monitored sources:

changelog · every 6h

SDK packages:

@slack/web-api@slack/boltslack_sdkslack-ruby-clientgithub.com/slack-go/slackjolicode/slack-php-apicom.slack.api:slack-api-client

Last polled: 9/16/2026, 12:00:03 AM

Change History

breakinghigh92% confidence

Slack system notifications previously delivered via Slackbot are now delivered from a new 'Slack' system user (USLACK). Apps that filter events or messages by Slackbot's user ID or username to identify system notifications must be updated to handle the new USLACK sender.

Migration: Update any logic that filters by Slackbot's user ID or checks the username field for 'Slackbot' to also handle the new 'Slack' system user (USLACK). Historical Slackbot system notifications will also be backfilled to the new DM.
model:USLACK system userparam:username (Slackbot)endpoint:chat.postMessage

9/16/2026

Effective: 6/17/2026

breakinghigh93% confidence

Slack system notifications (channel membership changes, User Group updates, Slack Connect alerts, retention policy notices) are now delivered from a new 'Slack' system user (USLACK) instead of Slackbot. Apps that filter events by Slackbot's user ID or username field will break.

Migration: Update any logic that filters events or messages by Slackbot's user ID or checks the username field for 'Slackbot' to instead handle the new 'Slack' system user (USLACK).
model:USLACK (Slack system user)endpoint:chat.postMessageparam:usernamemodel:message.user (Slackbot system notifications)

8/20/2026

Effective: 6/17/2026

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