Google algorithm updates shape how search results evolve, how websites are evaluated and how SEO strategies need to adapt over time. While individual updates may appear isolated, together they reveal a clear direction in how Google rewards quality, relevance and user satisfaction.
This guide documents major Google algorithm updates from 2021 onwards, explaining what each update focused on, what changed in search behaviour and what technical SEOs needed to understand in response.
2026
February 2026 Discover Update
The February 2026 Google Discover update focused on improving the quality and relevance of content shown in Discover feeds rather than standard search rankings. It placed greater emphasis on locally relevant content, meaning users were more likely to see articles from publishers in their own region.
There was also a clear move away from clickbait-style headlines, with stronger preference given to original, useful and well-structured content. Sites demonstrating clear topical focus and consistency saw the most stability, while those relying on broad or low-value content experienced increased volatility in Discover traffic.
March 2026 Spam Update
The March 2026 Google spam update was a fast-rolling algorithm update focused on enforcing spam policies at scale. It began on 24th March and was completed within a day, making it one of the quickest updates seen. The update targeted sites using manipulative tactics such as link spam, cloaking, scraped content and large volumes of low-quality pages created purely to rank.
Rather than introducing new signals, it refined Google’s ability to detect and devalue spam, leading to sudden drops for affected sites. It reinforced the importance of genuine, original content and natural link profiles across all industries.
March 2026 Core Update
The March 2026 Google core update was a broad algorithm update that refined how content quality, relevance and intent matching are evaluated across search results. It rolled out between 27 March and 8 April and caused noticeable volatility across multiple sectors, particularly for sites relying on scaled or heavily optimised content.
The update placed greater weight on content that demonstrates clear purpose, depth and alignment with user intent. Pages that fully answer queries, demonstrate real expertise, and maintain consistency across a site performed better. In contrast, sites with thin, overlapping or templated content saw declines, especially where multiple pages targeted similar keywords without adding distinct value.
There were also signs of improved evaluation of internal linking and site structure, with well-organised content hubs performing more consistently. Brand signals and trust factors continued to play a role, reinforcing the importance of building a credible, authoritative presence rather than relying on isolated page-level optimisation.
2025
March 2025 Core Update
The March 2025 Core Update continued Google’s focus on usefulness, originality and trust. While not as disruptive as March 2024, it caused meaningful movement for sites with unresolved quality issues.
This update reinforced that AI-generated content was not inherently penalised, but content lacking value or originality continued to struggle. Editorial oversight and subject matter expertise became increasingly important. Technical SEOs noted that sites with clear topical authority and disciplined publishing practices performed best.
June 2025 Core Update
The June 2025 Core Update refined how Google evaluated supporting content. Pages that existed purely to funnel traffic to primary pages without standalone value lost visibility. This reinforced the importance of meaningful supporting content rather than filler pages. Internal linking needed to reflect genuine topical relationships.
For technical SEOs, this update encouraged pruning and consolidation. Fewer, stronger pages outperformed large networks of weak ones.
August 2025 Spam Update
The August 2025 Spam Update targeted emerging manipulation patterns, particularly around AI-assisted spam and synthetic link networks. Google demonstrated improved detection of coordinated low-quality networks rather than individual pages. Sites involved in such networks saw widespread suppression.
December 2025 Core Update
The December 2025 Core Update closed the year by reinforcing themes seen throughout 2024 and 2025. Content quality, intent satisfaction and trust remained central. Sites that consistently invested in structure, hierarchy, and usefulness showed stable performance.
2024
March 2024 Core Update
The March 2024 Core Update was one of the most significant algorithm changes Google had released in several years. Google confirmed that this update involved improvements across multiple core ranking systems and was designed to reduce the visibility of low-quality and unoriginal content at scale.
For technical SEOs, the update reinforced the importance of site-wide quality signals. Individual strong pages were often unable to offset large volumes of weak content. Crawl efficiency, index control and content pruning became critical response strategies.
March 2024 Spam Update
The March 2024 Spam Update ran alongside the core update and targeted manipulative practices at scale. Google focused on scaled content abuse, site reputation abuse and expired domain abuse. Technical SEOs needed to assess not only content quality but also publishing intent and domain history.
June 2024 Spam Update
The June 2024 Spam Update continued Google’s enforcement against manipulative tactics. This update refined detection systems rather than introducing new policy areas. Many sites impacted had already been at risk following the March updates.
August 2024 Core Update
The August 2024 Core Update continued Google’s refinement of relevance and quality signals following the March changes. While less disruptive overall, it caused noticeable movement for sites that had made partial improvements. Internal linking, hierarchy and topical focus again played key roles.
November 2024 Core Update
The November 2024 Core Update focused heavily on intent satisfaction. Pages that technically matched keywords but failed to meet user expectations lost ground. This was particularly visible in informational content, where shallow answers previously ranked due to strong authority signals.
December 2024 Core Update
The December 2024 Core Update acted as a refinement rather than a reset. Many sites saw stabilisation rather than dramatic shifts. This update reinforced the idea that core updates increasingly operate as ongoing adjustments rather than isolated events.
December 2024 Spam Update
The December 2024 Spam Update closed the year with further enforcement against manipulative practices. It reinforced policies around scaled content and deceptive techniques.
2023
February 2023 Product Reviews Update
The February 2023 Product Reviews update continued Google’s effort to improve the quality of review-based content. This update further refined how Google assessed evidence of firsthand experience. Reviews that demonstrated actual product usage, original testing or detailed comparisons continued to benefit.
March 2023 Core Update
The March 2023 Core Update was a broad algorithm update that caused noticeable volatility. Sites impacted often saw changes across a wide range of keywords rather than isolated drops, suggesting a reassessment of overall relevance and quality.
April 2023 Reviews Update
The April 2023 Reviews update expanded Google’s review quality systems beyond product reviews to include services, businesses and other entities. Reviews needed to demonstrate expertise, depth and genuine insight.
August 2023 Core Update
The August 2023 Core Update caused significant ranking shifts. It reinforced Google’s focus on content usefulness, relevance and authority. Many sites affected had previously benefited from strong backlink profiles despite weaker content alignment.
September 2023 Helpful Content Update
The September 2023 Helpful Content update refined and expanded the site-wide classifier introduced in 2022. Google improved its ability to identify content created primarily for search engines rather than users.
October 2023 Spam Update
The October 2023 Spam Update targeted a range of spam techniques, including cloaking, hacked content and scaled spam. It also improved the detection of more subtle manipulative practices.
October 2023 Core Update
The October 2023 Core Update continued Google’s refinement of relevance and quality signals. The proximity of updates reinforced that SEO performance is influenced by multiple systems working together.
November 2023 Core Update
The November 2023 Core Update reinforced Google’s emphasis on expertise, relevance and trust. Sites with strong topical focus and consistent quality performed better than those with broad but shallow coverage.
November 2023 Reviews Update
The November 2023 Reviews update continued Google’s ongoing refinement of review evaluation systems. This update placed further emphasis on originality and depth.
2022
Page Experience Update for Desktop
The Page Experience update for desktop extended Google’s user experience signals beyond mobile search. Google confirmed that desktop rankings would factor in metrics such as loading performance, interactivity and visual stability (Core Web Vitals).
March 2022 Product Reviews Update
The March 2022 Product Reviews update broadened the scope to include service reviews and software reviews. Google clarified that reviews needed to demonstrate original insight and meaningful comparisons.
May 2022 Core Update
The May 2022 Core Update was a broad reassessment of ranking signals. It adjusted how relevance, quality and trust signals were weighted across all search results.
July 2022 Product Reviews Update
The July 2022 Product Reviews update refined how Google evaluated review freshness. Reviews that remained static over long periods without updates lost competitiveness.
August 2022 Helpful Content Update
The August 2022 Helpful Content update introduced a site-wide classifier designed to identify content created primarily for search engines. This marked a move away from purely page-by-page evaluation.
September 2022 Core Update
The September 2022 Core Update continued the refinement of quality signals and overlapped closely with the Helpful Content update.
September 2022 Product Reviews Update
This update continued the push toward rewarding in-depth, experience-driven review content, refining signals around originality and analysis.
October 2022 Spam Update
The October 2022 Spam Update targeted manipulative practices such as cloaking and scaled spam. It highlighted the importance of security and site hygiene.
December 2022 Helpful Content Update
The December 2022 Helpful Content update expanded the original classifier and refined its accuracy across more languages and sectors.
December 2022 Link Spam Update
The December 2022 Link Spam Update further neutralised unnatural links at scale using SpamBrain, Google’s AI-based spam-prevention system.
2021
April 2021 Product Reviews Update
The April 2021 Product Reviews update targeted affiliate and review sites that relied heavily on thin summaries. It rewarded reviews that demonstrated genuine expertise and firsthand experience.
June 2021 Core Update
The June 2021 Core Update was a broad algorithm change. It set the foundation for a two-part rollout, with the second half arriving in July.
Page Experience Update for Mobile
The Page Experience update for mobile introduced Core Web Vitals (LCP, FID, CLS) as ranking signals for mobile search results.
June 2021 Spam Update
The June 2021 Spam Update focused on identifying and neutralising sites violating Google spam policies, specifically auto-generated and scraped material.
July 2021 Core Update
The July 2021 Core Update completed the changes begun in June, reinforcing intent matching and site-wide quality assessments.
July 2021 Link Spam Update
The July 2021 Link Spam Update targeted unnatural linking practices, such as paid links and guest posting for SEO, by devaluing the links rather than penalising the site.
November 2021 Spam Update
The November 2021 Spam Update continued Google’s efforts to suppress low-quality and deceptive practices like cloaking and hacked content.
November 2021 Core Update
The November 2021 Core Update was a major year-end adjustment focusing on content relevance, expertise signals, and site consistency.
December 2021 Product Reviews Update
The December 2021 Product Reviews update built on the April changes, further expanding the evaluation of review depth and original value.
Looking back at Google algorithm updates from 2021 to 2026, one consistent message emerges: Google rewards sites that demonstrate sustained quality, clear intent and strong technical foundations over time. Core updates, spam systems, and helpful content classifiers all point toward building for the user rather than the algorithm.
