The Google Dewey update was a large reshuffle of search results that Search Engine Land dates to 31 March 2008, with other trackers listing April 2008. Matt Cutts acknowledged the change and asked webmasters to send feedback tagged “dewey”, but Google never explained what it actually changed. The takeaway: Dewey is a reminder that some updates are never explained, and that well-documented feedback is more useful than speculation.
You will find Dewey alongside the better-known updates in my full list of Google algorithm updates. This page is short because the record is short.
| Detail | Information |
|---|---|
| Update name | Google Dewey Update |
| Type | Unspecified ranking change |
| Rollout started | 31 March 2008 per Search Engine Land; Sistrix and Moz list April 2008 |
| Rollout finished | Not announced |
| Rollout length | Unknown |
| Confirmed by Google | Partially: Matt Cutts acknowledged it and asked for feedback, but gave no details |
| Official source | No Google page; report: Search Engine Land |
What the Dewey update changed
The nature of the change was never explained. What we know:
- Webmasters reported a large shuffle of results in late March and April 2008.
- Matt Cutts asked people to send feedback through Google’s form with “dewey” in the additional details field, so Google could find the reports. Search Engine Land proposed the name.
- Cutts said he did not see large ranking differences between data centres, which suggested the change was already widely deployed rather than still rolling out.
- Some people suspected Google was promoting its own properties in the results. Wikipedia notes this suspicion, but the evidence for it was limited.
Who was affected
Webmasters reported broad, unspecific ranking changes. No particular type of site, industry or tactic has been reliably linked to Dewey, so I would not trust any article that claims to know exactly who lost out.
How to tell if the Dewey update hit your site
A 2008 drop cannot be checked now. The relevant question today is what to do when results shift and Google says nothing useful. My approach:
- Confirm the drop is real in Search Console, comparing the two weeks before the change with the two weeks after.
- Check whether losses cluster on one section, page type or group of queries. A broad, even drop across everything is more likely to be a site-wide issue such as indexing or tracking.
- Write down specific examples: the query, your URL, the position before and after, and what now ranks above you. This is the kind of evidence Cutts was asking for with Dewey, and it is also what you need to make any decision yourself.
How to recover from the Dewey update
No recovery pattern was ever documented. Google invited specific feedback cases instead of offering a fix, and standard compliance with Google’s guidelines applied. For an unexplained update today, I would avoid sweeping changes and instead fix the clear weaknesses the evidence shows: pages that answer the query less well than those now ranking, technical problems blocking indexing, or thin sections dragging the site down. My technical SEO services cover the indexing side of that check.
Is it still relevant today?
Not beyond history. It is one of several updates from the period that were named, debated and never explained.
Frequently asked questions
When was the Google Dewey update?
Search Engine Land lists 31 March 2008. Sistrix and Moz list it as April 2008. The end date was never announced.
What did the Dewey update do?
Google never said. Matt Cutts acknowledged a change and asked for feedback, but did not describe what it was.
Did Dewey favour Google’s own sites?
Some people suspected so at the time, but Wikipedia notes the evidence for this was limited, and Google did not confirm it.
Sources
- Search Engine Land: Google update Dewey, Google confirms algorithm change
- Search Engine Land: Google algorithm updates
- Sistrix: Google updates and algorithm changes
- Wikipedia: Timeline of Google Search
If your traffic has shifted and you cannot find an explanation, request a free audit. My SEO audit service looks at the evidence page by page before recommending any changes.
More Google algorithm updates
- Previous update: Buffy Update (June 2007)
- Next update: Vince Update (February 2009)
Other other updates:
- Gilligan Update (September 2005)
- Brand Update (August 2010) (19 Aug 2010)
- Site Diversity Update (June 2019) (4 Jun 2019)
- Featured Snippet Deduplication (January 2020) (22 Jan 2020)