On this page
- What is a Google algorithm update?
- Types of Google updates
- Important Google updates in recent history
- How Google's ranking systems fit together
- Core updates explained in depth
- Spam updates and Google's spam policies
- The updates that shaped modern SEO
- Manual actions vs algorithm updates
- Diagnose the drop page by page
- Which sites updates tend to hit hardest
- Local search updates
- Update readiness checklist
- How to tell if an update affected your site
- What to do after a ranking drop
- How to make your site more resilient
- Recovery steps once an update finishes
- Where to follow update news
- Myths about Google algorithm updates
- How to talk about an update with your team or clients
- Updates and AI search
- FAQs
When rankings move suddenly, an algorithm update is often the first suspect. Sometimes that is right; often the cause is seasonality, a technical problem or a competitor. Understanding how updates work helps you tell the difference and respond calmly.
Google publishes confirmed ranking updates on its Search Status Dashboard and explains its guidance in Search Central. The advice is consistent: create helpful, reliable content for people, and avoid tactics that try to manipulate rankings. See our glossary entry on core updates for a short definition.
A full technical and content review with the priorities to fix first.
Request my SEO audit Chat on WhatsApp- Core updates reassess quality broadly; they do not target individual sites.
- Spam updates target specific tactics such as link spam and scaled low value content.
- Wait for an update to finish rolling out before judging the impact.
- Recover by improving content quality and usefulness, not with quick tweaks.
What is a Google algorithm update?
Google ranks pages with many automated systems that look at hundreds of signals, from the words on a page to the links pointing at it. A Google algorithm update is a change to one or more of those systems. Google makes thousands of small changes every year that nobody notices, plus a handful of large ones that shift rankings across many sites at once.
The large ones are the updates people talk about. Google confirms many of them on its Search Status Dashboard, gives them a name such as "March 2024 core update", and usually says when the rollout starts and ends. Knowing how these Google algorithm updates work helps you react calmly, judge whether your site was really affected, and build pages that hold up through future changes.
Types of Google updates
| Update type | What it does | How often |
|---|---|---|
| Core updates | Broad changes to how quality and relevance are judged | Several times a year |
| Spam updates | Improve detection of spam tactics such as link spam | A few times a year |
| Helpful content signals | Reward people first content; now part of core systems | Folded into core updates since 2024 |
| Reviews updates | Reward in depth, first hand product reviews | Now part of core systems |
| Local and other system updates | Changes to local results, page experience and other systems | Varies |
Important Google updates in recent history
| Update | Year | Focus |
|---|---|---|
| Panda | 2011 | Low quality and thin content |
| Penguin | 2012 | Manipulative links |
| Hummingbird | 2013 | Understanding the meaning of queries |
| Mobile friendly update | 2015 | Mobile usability |
| RankBrain | 2015 | Machine learning for query understanding |
| Medic core update | 2018 | Large impact on health and finance (YMYL) sites |
| BERT | 2019 | Natural language understanding |
| Page experience | 2021 | Core Web Vitals and usability signals |
| Helpful content update | 2022 | Content made mainly for search engines |
| March 2024 core and spam updates | 2024 | Helpful content folded into core; scaled content, site reputation and expired domain abuse policies |
| AI Overviews rollout | 2024 onwards | AI generated summaries in results |
Many older systems are now part of Google's core ranking systems rather than separate updates.
How Google's ranking systems fit together
Google publishes a guide to its main ranking systems. It helps to know them, because most named updates are changes to one of these systems rather than something brand new.
| System | What it does |
|---|---|
| RankBrain | Uses machine learning to understand how words relate to concepts, so results match the meaning of a query |
| Neural matching | Connects queries with pages that cover the same idea, even with different words |
| BERT | Understands how word order and small words change meaning |
| Helpful content signals | Reward content made for people and demote content made mainly to rank |
| Reviews system | Rewards in depth reviews with first hand experience |
| Link analysis and PageRank | Use links to understand what pages are about and how important they are |
| SpamBrain | An AI based system that detects spam, including link spam |
| Freshness systems | Show newer content when a query needs it, such as news |
| Page experience signals | Consider usability factors like mobile friendliness and Core Web Vitals |
| Original content systems | Help original reporting rank above copies |
A core update usually adjusts how these systems weigh signals. A spam update usually improves SpamBrain or the rules behind Google's spam policies.
Core updates explained in depth
Core updates are the broad changes Google rolls out several times a year. They do not target one tactic. Instead they change how Google judges quality and relevance across all kinds of sites, which is why some sites rise and others fall without having changed anything.
They are not penalties
Google says a drop after a core update does not mean the site broke a rule. It often means other pages are now judged more helpful for those searches.
Rollouts take about two weeks
Rankings can swing up and down during the rollout. Wait until Google confirms it is complete before you judge the result.
Recovery can take months
Some sites recover within weeks after improving content. Others see the full benefit only after the next core update, when Google reassesses the site.
Whole site signals matter
Large amounts of unhelpful content can weigh on a site overall, so improving or removing weak pages can help the strong ones too.
Spam updates and Google's spam policies
Spam updates target tactics that break Google's spam policies. Unlike core updates, a spam update can hit a site because of something specific it did. These are the main policies to know.
| Policy | What it covers |
|---|---|
| Cloaking | Showing search engines different content from users |
| Doorway pages | Many near identical pages built only to rank for variations, such as city names |
| Hidden text and links | Text or links hidden from users to influence rankings |
| Keyword stuffing | Filling pages with keywords in an unnatural way |
| Link spam | Buying links, large scale link exchanges or automated link building |
| Scaled content abuse | Mass producing pages, by AI or by people, mainly to rank rather than help |
| Site reputation abuse | Third party pages published on a trusted site to ride its ranking signals |
| Expired domain abuse | Buying old domains to host low value content using their past reputation |
| Thin affiliation | Affiliate pages that add nothing beyond the merchant's own content |
If you use location pages, make sure each one has real, local detail. Thin copies with only the city name changed can count as doorway pages.
The updates that shaped modern SEO
Panda (2011)
Panda targeted thin, low quality and duplicate content farms. It taught site owners that publishing many shallow pages could hurt the whole domain. Panda later became part of the core algorithm.
Penguin (2012)
Penguin hit sites that built links through paid networks, spammy directories and over optimised anchor text. Since 2016 it runs in real time and mostly devalues bad links rather than punishing the whole site.
Hummingbird (2013)
A rebuild of how Google reads queries, focused on meaning rather than exact keyword matches. It paved the way for conversational and voice search.
Pigeon (2014)
Tied local results more closely to traditional web ranking signals, changing how local businesses appear in maps and local packs.
Medic (2018)
A broad core update with a strong effect on health, finance and other "your money or your life" topics, where trust and expertise matter most.
Helpful content (2022)
Introduced a site wide signal against content written mainly for search engines. In March 2024 it was folded into the core ranking systems.
Manual actions vs algorithm updates
A manual action is a penalty applied by a human reviewer at Google, and it is very different from being affected by an update. Check the Manual actions report in Search Console to rule it out first.
| Algorithm update | Manual action | |
|---|---|---|
| Who applies it | Automated systems | A Google reviewer |
| Notice | None for your site specifically | Message in Search Console |
| Cause | Changed quality or relevance signals | Clear breach of spam policies |
| Fix | Improve content and site quality over time | Fix the issue and file a reconsideration request |
| Timeline | Weeks to months, often until the next update | Days to weeks after a successful request |
Diagnose the drop page by page
A traffic chart tells you something changed. A page level review tells you what. Use this process once an update has finished rolling out.
- 1In Search Console, compare the two weeks after the update ended with the two weeks before it started.
- 2Sort pages by the biggest drop in clicks, then by the biggest gains.
- 3Group the losing pages by type: blog posts, service pages, product pages, location pages.
- 4For the top losing queries, search them and look at who ranks now. Note what those pages do better: more depth, first hand experience, fresher facts, clearer answers.
- 5Check whether the losing pages overlap with each other or with stronger pages on your site.
- 6Look for patterns, such as thin pages, outdated content, heavy ads or pages written mainly to target keywords.
- 7Make a list of pages to improve, merge, or remove, starting with the ones that matter most to the business.
- 8Record what you change and when, so you can measure the effect over the next few months.
If the cause is unclear, an independent SEO audit can review content quality, links and technical health together.
Which sites updates tend to hit hardest
Health, money and legal topics
These "your money or your life" topics face higher quality expectations, so changes in how trust is judged show up here first.
Affiliate and review sites
Sites that summarise products without testing them have been hit repeatedly by reviews and core updates.
Mass produced content sites
Sites with thousands of templated or AI generated pages that add little value are a direct target of scaled content policies.
Sites relying on one tactic
A site that ranks mainly through bought links or one loophole is exposed when Google closes that loophole.
Local search updates
Local results have their own history of updates. Google confirmed a local search update in November 2021 that changed how much weight proximity and relevance carry in local rankings, and smaller local changes happen often without announcements.
What local updates usually change
How far from the searcher a business can be and still rank, how categories and keywords in profiles are used, and how reviews and spam are handled.
How to stay steady
Keep your Google Business Profile accurate and complete, earn reviews steadily, build strong location and service pages, and avoid keyword stuffing in your business name.
Our Google Business Profile optimization service focuses on these steady local signals.
Update readiness checklist
- 1Each important page clearly helps a real reader, written by someone with real knowledge.
- 2No large sets of thin, near duplicate or templated pages.
- 3Author and business details easy to find.
- 4Content reviewed and updated at least yearly.
- 5No paid or manipulative link schemes.
- 6Technical health checked monthly: indexing, speed, errors.
- 7Traffic from more than one channel, such as email and referrals.
- 8A change log so you can link ranking moves to dates.
- 9Search Status Dashboard and Search Central blog followed for announcements.
How to tell if an update affected your site
- 1Check the Google Search Status Dashboard for confirmed updates and their dates.
- 2Compare your Search Console clicks before and after the rollout window.
- 3Look at which pages and queries changed most.
- 4Compare the same period last year to rule out seasonality.
- 5Check for technical issues such as indexing errors or server problems on those dates.
- 6See whether competitors gained the positions you lost.
What to do after a ranking drop
Do not panic or make rushed changes
Rankings often move during the two week rollout. Wait until it finishes.
Review content against Google's guidance
Ask whether each affected page is original, helpful, accurate and written with real expertise.
Improve, do not just tweak
Add depth, first hand experience, better answers and clearer structure.
Remove or improve low value pages
Thin, outdated or overlapping pages can weigh on how a site is judged.
Check for spam issues
Look for manual actions and clean up manipulative links or scaled content.
Be patient
Recovery often shows at a later core update after improvements are made.
How to make your site more resilient
Build real expertise
Named experts, first hand experience and trusted sources hold up well. See E-E-A-T.
Avoid scaled low value content
Mass produced pages, including unedited AI content, are often hit hardest.
Diversify traffic
Email, referrals and branded search reduce dependence on any single algorithm.
Keep technical health strong
Fast, crawlable, well structured sites give updates less to penalise.
Monitor regularly
Annotate update dates in analytics so you can link changes to causes.
Recovery steps once an update finishes
- 1Wait until Google confirms the rollout is complete before judging results.
- 2List the pages and queries that lost the most clicks in Search Console.
- 3Compare each losing page with the pages that now outrank it.
- 4Improve depth, accuracy and first hand experience on those pages.
- 5Merge or remove thin pages that add little value.
- 6Track changes and review again after the next core update.
Where to follow update news
| Source | What it offers |
|---|---|
| Google Search Status Dashboard | Official update start and end dates |
| Google Search Central blog | Guidance and announcements |
| Google Search Liaison posts | Clarifications from Google |
| Industry news sites | Analysis and community data |
Myths about Google algorithm updates
| Myth | What is actually true |
|---|---|
| Google targets small businesses | Updates apply to all sites; small sites with helpful, specific content often gain |
| AI content is always penalised | Google judges helpfulness, not who or what wrote it; mass produced low value content is the problem |
| You must make changes during the rollout | Rankings swing during rollouts; wait until it ends before acting |
| Disavowing links fixes core update drops | Core updates are about quality and relevance; disavow is only for clear link spam problems |
| Every drop is caused by an update | Tracking errors, site changes, seasonality and competitors cause many drops |
| Recovery means reverting to old content | Lasting recovery comes from making pages more helpful than the ones now ranking |
How to talk about an update with your team or clients
Updates cause stress, especially when leads depend on search. A calm, evidence based message helps everyone make better decisions.
Share facts first
State the update name, dates, and the measured change in clicks and leads, with a year over year comparison.
Separate cause from timing
A drop that lines up with an update may still have another cause. Say what you have checked and what you still need to check.
Agree a plan and a review date
List the pages to improve, who will do the work and when you will review the results. Then stick to it rather than reacting to daily swings.
If you need a second opinion, our SEO consulting team can review the data with you.
Updates and AI search
AI Overviews and AI Mode rely on Google's core ranking systems to choose sources. Sites that do well in core updates, with clear, trustworthy and useful content, tend to be cited more in AI answers. Read more in our guide to AEO vs GEO vs SEO.