Published on September 28, 2026 · The mitza.es team
Google began rolling out its fourth 2026 spam update on 24 September 2026 at 09:15 US Pacific time, following those of March, June and August. It's a global rollout affecting all languages, and it relies on SpamBrain, Google's AI-based detection system used to identify content that tries to manipulate rankings through deceptive practices.
Timeline and length of the rollout
The first thing that stands out about this update is how long it's taking to complete compared to the previous ones in 2026:
- March 2026: completed in 19 hours and 30 minutes.
- June 2026: completed in 2 days and 1 hour.
- August 2026: completed in 2 days and 16 hours.
- September 2026: Google has announced a rollout window of up to two weeks.
A longer rollout doesn't necessarily mean a bigger impact, but it usually points to more complex changes being applied at scale. With the rollout still in progress, traffic and ranking shifts seen in the first few days still don't allow for reliable conclusions.
What we know, and don't know, about what's changing
Google hasn't publicly detailed which specific signals it's adjusting with this update, as is usual with this kind of rollout. What we do know is the stated goal, as always: reduce the visibility of content created primarily to manipulate rankings instead of helping the person searching. Going by the August update, the most likely pattern is continued refinement of detection for AI-generated content published without review or real added value, so-called "AI slop".
Four updates in one year: what this says about the current landscape
The fact that Google has already rolled out four spam updates in 2026, against a historically more spaced out cadence, fits with what we've been observing across the rest of the search ecosystem: AI Overviews and the rise of AI-based search engines are rapidly changing how visibility gets distributed in search. The more low-quality content competes for the same spot, the more pressure Google has to filter it more often.
What to do while the rollout completes
With a rollout window of up to two weeks announced, it doesn't make sense to react to every daily swing in Search Console rankings: it's worth waiting for the rollout to finish before comparing data reliably. In the meantime, it's a good time to review your own content against the same criteria we already covered in the August update: real editorial judgement, original cases, verifiable data, and a clear reason for that content to exist on your site rather than on a hundred identical others.
If you want to review it before the rollout finishes
If you're not sure whether some of your current content might be in the risk zone, you can request an audit focused on content quality. And if you need to strengthen or create new content with real editorial judgement instead of generic text, that's exactly the approach behind our content generation service.