A spam update is a change Google makes to the automated systems that detect websites breaking its spam policies, such as manipulative links, cloaking, scaled low-value content or hacked pages. Google announces each one on its Search Status Dashboard and usually rolls it out over a few days to a few weeks.
How spam updates work
Google’s spam policies list the practices it acts against. Most enforcement happens automatically through its spam-detection systems, the best known of which is SpamBrain, an AI-based system Google has described publicly since 2022. A spam update improves those systems so they catch more of the behaviour the policies already describe.
Some spam updates focus on one area. Link spam updates, for example, aim to neutralise manipulative links, so they simply stop passing value rather than penalising the site directly. Others are general and cover several policies at once. Spam updates are separate from core updates, which change how Google assesses relevance and quality for everyone and are not about rule-breaking. They are also separate from manual actions, which a Google reviewer applies to a specific site.
Why it matters
Most UK businesses doing ordinary, honest marketing will never notice a spam update. The ones that do are usually carrying something from the past: links bought through a previous agency, hundreds of near-identical town pages, an expired domain bought for its links, or a section of the site filled with automatically generated content.
When a spam update catches that kind of tactic, the drop can be sudden and steep, and it does not reverse when the rollout finishes. If rankings were being held up by links that have now been neutralised, they will not come back unless the site earns genuine strength to replace them.
Spam updates also reshape the results you compete in. When Google clears out link spam or scaled content in a sector, honest local businesses sometimes move up because competitors that relied on those tactics drop away. Your rankings can shift during a rollout even though nothing on your site was targeted, which is another reason to read the data carefully before drawing conclusions.
Common mistakes
- Blaming the update for everything. Spam updates often overlap with core updates, seasonal changes or a site launch. Check other causes first.
- Panic disavowing. Uploading a huge disavow file after a link spam update rarely helps, because Google has usually already ignored the bad links.
- Doubling down. Buying more links or publishing more scaled content to make up the loss risks a deeper problem.
- Waiting for the next update. Recovery depends on fixing the cause, not on the timing of Google’s announcements.
How to act on it
Keep a simple log of Google’s announced updates next to your own site changes, so you can match dates quickly. If traffic falls during a spam update rollout, compare Search Console data a week or two either side and identify which pages and queries lost the most.
Then read Google’s spam policies one by one and test your site honestly against each. Look at your backlink profile for paid or swapped links that would fit a link scheme, at templated pages that add nothing, and at any third-party content you host. Remove or improve what you find and accept that recovery takes time. If you want an outside view, an SEO audit is where I check for exactly these risks before recommending anything else.