Google confirms March 2026 Core Update

Google finalises its Core Update for March 2026

   Google has officially confirmed the completion of its Core Update March 2026, one of the most relevant updates to the algorithm in recent months. As is usually the case with this type of change, the impact has been global, but with particularly visible effects in competitive markets such as Spain.

   For several weeks, professionals from the SEO have detected strong fluctuations in rankings, organic traffic and visibility, affecting both large media and niche, affiliate and ecommerce sites.

   Unlike other more specific updates, core updates do not directly penalise, but rather reorder the results according to the perceived quality of content.

Chronology of the update

The update followed a pattern that is now commonplace at Google:

• 📌 Start: early March 2026
• ⏳ Duration: 2 to 3 weeks
• Completion: confirmed by end of March

During this period, it was common to see sharp rises and falls in rankings, which is completely normal for such deployments.

What really changes in this Core Update

Although Google does not reveal all the details, data analysis and SEO tools can identify clear trends.

1. Reinforcement of E-E-A-T (Experience, Authority, Trust)

The concept E-E-A-T (Experience, Expertise, Authoritativeness, Trust) is consolidated as one of the pillars of positioning.

In this update:

• Priority is given to content created by people with real experience.
• It increases the importance of showing the author's credentials.
• The reputation of the website is assessed and the brand.

Relevant data:

• More from the 70% of top-ranked pages include detailed author information.
• The YMYL (Your Money Your Life) sectors are the most demanding.

 In Spain, this directly affects:

• Finance (mortgages, investment, loans)
• Health (nutrition, medicine, wellness)
• Legal (lawyers, consultancies)

2. Specialised content gains ground

One of the clearest conclusions is the shift towards the hyperspecialisation.

Google is rewarding:

• Websites focused on a specific topic
• In-depth and well-structured content
• Topic cluster architectures“

In the meantime, they lose visibility:

• Generalist blogs
• Websites that try to rank for everything without authority
• Surface content

Example:

A blog focused exclusively on “personal finance in Spain”.” has more possibilities than a generic “global economy” one.

3. Affiliation bashing and undifferentiated content

Affiliation websites have been one of the main victims.

Observed trends:

• Significant falls in non-value added comparators.
• Indirect penalty for repetitive content.
• Lower visibility for pages with little original content.

Particularly affected:

• Generic reviews.
• Best product“ rankings with no real experience.
• AI-generated content without human editing

 Key: Google demands now real value, evidence, experience and differentiation.

4. Increased weight of technical SEO and user experience

Web performance continues to gain prominence.

Key factors:

• ⚡ Loading speed (ideally < 2 seconds)
• 📱 Mobile-first optimisation
• 🧭 Clear navigation and UX
• ❌ Elimination of technical errors

Important fact:
Almost the 50% of webs with performance problems have lost positions after the update.

 In Spain, many SMEs still have room for improvement in this area, which represents a competitive opportunity.

5. Impact of AI Overviews and changes in user behaviour

Although not directly part of the core update, the current context is marked by the integration of AI into search results.

AI Overviews

• Reduce the number of organic clicks
• They prioritise clear, structured and reliable content

In some sectors:

• Drop of up to 40% in organic CTR

Google Discover

• Reduced national media outreach
• Increased local segmentation

This especially affects Spanish digital media that relied on massive traffic.

Most affected sectors in Spain

🔻 Sectors that have lost visibility

• Affiliation (Amazon, comparison sites)
• Generic SEO blogs
• Digital media without specialisation
• Websites with automated content

🔺 Sectors that have gained

• Specialised media
• Brands with established authority
• Websites with expert authors
• Well-optimised local business

What this update means for SEO in Spain

The Core Update of March 2026 reinforces a structural change:

SEO is no longer about ranking content, but about demonstrating real authority.

This implies:

• Less reliance on “SEO tricks”
• More focus on branding
• Increased importance of reputation

In the Spanish market, where many websites still rely on traditional strategies, this makes a clear difference between the two:

✔️ Sustainable projects
❌ Volume-based projects

How to adapt to the Core Update (practical guide)

1. Improve your content

Ask yourself these questions:

• Does it bring anything new?
• Is it written by someone with experience?
• Is it more responsive than the competition?

Concrete actions:

• Add real examples
• Include data and statistics
• Going deeper into each topic

2. Reinforce E-E-A-A-T

Key elements:

• About us“ page in full
• Author with name and surname
• Links to professional profiles
• Opinions and reviews

Council: In Spain, adding business transparency (VAT number, address, team) improves trust.

3. Optimise technical SEO

Checklist:

• Improve speed (PageSpeed Insights)
• Review Core Web Vitals
• Correct tracking errors
• Optimise mobile version

4. Audit and update old content

Many sites regain traffic simply by updating content.

What to do:

• Improve old articles
• Add updated information
• Remove low-quality content

5. Avoid unsupervised AI abuse.

AI is useful, but:

❌ Should not be used to generate mass content without review.
✔️ To be complemented by human experience

SEO opportunities after the update

While many see these updates as a problem, they also open up opportunities:

• Less low-quality competition
• Increased visibility for real experts
• Growth for specialised niches

In Spain, sectors such as education, health, personal finance and local business have great potential.

SEO trends after March 2026

All indications are that Google will continue to move towards:

• Further integration of AI
• More weight of brand authority
• More accurate assessment of useful content

This means that the SEO of the future will be:

✔️ More strategic
✔️ More human
✔️ More focused on real value

Conclusion

The Core Update in March 2026 is not just another update: it is a firm step towards an ecosystem where only truly useful and reliable content stands out.

For the Spanish market, this means:

• The end of volume-based SEO
• The consolidation of authority-based SEO
• An opportunity for those who do things right

The key is clear:

don't write for Google, write to be the best possible answer.