Welcome to this week’s Pulse: Updates affect when you can start analyzing baseline performance of updates, how reliable your print data is, and what Google CEO thinks AI will do to software security.
This is what matters to you and your work.
The March 2026 Core Update is Complete
Google’s March 2026 Core Update rolled out on April 8. Google Search Health Dashboard confirms completion.
Highlights: The deployment lasted 12 days, from March 27 to April 8. This matches Google’s estimate of two weeks and is faster than the December update, which took 18 days. Google called it a “regular update” and did not publish a follow-up blog post or new guidance. This is the third confirmed update in about five weeks, following February’s main Discover update and March’s anti-spam update.
Why it matters
You can now perform a clean before-and-after comparison in Search Console. Google recommends waiting at least a full week after completion before drawing conclusions, meaning mid-April is the prime window for reliable analysis.
A drop in ranking after a core update does not mean your site has violated a policy. Core updates reevaluate the quality of content on the web. Some pages go up while others go down. Roger Montti, writing for Search Engine Journal, suggested the spam then kernel sequencing may not be a coincidence, describing it as cleaning the table before recalibrating the quality signals.
What SEO Professionals Say
Lily Ray, Vice President, SEO and AI Research at Amsive, rated on that YouTube has gained visibility since the core update began rolling out:
“I just checked a client ranked in AI Previews last week and now the top 4 links in AI Previews are all YouTube.
Let me guess: The core update was another way for Google to boost YouTube, like it did with the Discover core update.
Aleyda Solís, SEO consultant and founder of Orainti, is launch a survey on LinkedIn asking what impact the update had on people’s websites. Currently, most respondents believe the impact of the update is positive or not noticeable.
Read our full coverage: Google confirms March 2026 core update is complete
Google fixes Search Console bug that inflated impressions for nearly a year
Google confirmed a logging error in Search Console that overestimated impressions from May 13, 2025. The company updated its Data Anomalies page on April 3 to acknowledge the problem.
Highlights: The bug lasted for almost 11 months before Google publicly acknowledged it. Clicks and other statistics have not been affected. Google said the fix would roll out over the next few weeks and sites may see a decrease in reported impressions during this period.
Why it matters
If your impression numbers seem unusually healthy since last May, this bug is probably part of the reason. The fix will change what your performance report shows, but it will not change how your site actually performs in search. Printouts were not saved correctly. Your actual visibility may not have changed.
Teams that have been reporting sentiment-based metrics to customers or stakeholders since May were working with inflated numbers. Click data provides a clearer signal for performance analysis during patch deployment. Treat May 13, 2025 as a data annotation point, the same way you would mark an algorithm update date in your reports.
What SEO Professionals Say
Brodie Clark, independent SEO consultant, reported the problem on March 30, four days before Google’s recognition. He wrote:
“Warning: There is something weird happening with Google Search Console data right now.
Similar to the changes that appeared after disabling &num=100, prints skyrocket for specific surfaces on desktop.
Clark documented spikes in impressions in merchant listings and Google Images filters across several e-commerce sites and asked the Search Console team to investigate.
Chris Long, co-founder of Nectiv, wrote on LinkedIn: “Holy moly SEO. Turns out Google has been accidentally inflating impressions in Search Console reports for ALMOST A YEAR.” Long noted that Google hasn’t indicated how much impressions will decline and that the profiles he’s checked appear stable so far.
Source: Google data anomalies in Search Console
Pichai says AI could ‘break almost all software’
Google CEO Sundar Pichai said AI models “are going to break just about every piece of software” during a podcast conversation with Stripe CEO Patrick Collison. The interview focused on AI infrastructure constraints and security risks.
Highlights: Pichai presented software security as a hidden constraint on AI deployment, alongside memory and energy provisioning. When investor Elad Gil mentioned learning that zero-day black market prices were falling because AI was increasing the supply of detectable vulnerabilities, Pichai said he was “not surprised at all.”
Why it matters
The security conversation may seem distant from everyday SEO work, but it’s related to the infrastructure your sites run on. If AI accelerates the detection and exploitation of vulnerabilities, the time between an existing vulnerability and an attacker using it shortens. This puts more pressure on maintaining current patches and auditing dependencies.
Pichai’s comments were conversational and did not constitute a formal statement of Google policy. But they come from someone who oversees both the company’s AI models and its threat intelligence operations. Google’s threat teams have warned of software security risks from faster discovery of vulnerabilities.
Read our full coverage: Pichai says AI could ‘break almost all software’
Mueller calls self-proclaimed SEO gurus ‘clueless impostors’
Google’s John Mueller responded to a blog post by SEO professional Preeti Gupta about how the word “guru” is misused in the SEO industry. Mueller shared his views on Bluesky.
Highlights: Mueller wrote:
“To me, when someone declares themselves an SEO guru, it’s an extremely obvious sign that they are an ignorant imposter. SEO is not based on beliefs, no one knows everything and it changes over time. You need to recognize that you have been wrong sometimes, learn and practice more.”
Gupta’s original post explained that in India, the word guru has a deep cultural and spiritual meaning that is trivialized when SEO practitioners use it as a self-applied label.
Why it matters
The gist of what Mueller said is that SEO evolves over time and no one has it all figured out.
Just look at what happened this week. Core updates continue to happen without a clear explanation of what has changed. A basic logging bug in Search Console went unnoticed for almost a year. The tools and signals we rely on every day are imperfect, and treating any methodology or perspective as established knowledge is how mistakes are made.
Read Roger Montti’s full coverage: Google’s Mueller on SEO Gurus Who Are ‘Clueless Imposters’
Theme of the week: Daily work continues
Speculation about where the research will go has never been higher. But this week’s events were the end of a core update, a data bug fixed, and a Google Search Advocate reminding people that no one has all the answers.
The future Pichai describes may be coming, but it has not yet arrived. Right now, the job is still reading your Search Console data, waiting for a core update to install, and being honest about what you do and don’t know.
Mueller’s comment that SEO “is not based on beliefs” and “changes over time” is as good a summary of this week as any. Those who succeed in the next version of research will likely be those who pay attention to this version first.
Top stories of the week:
Here are the main links from this week’s coverage.
More resources:
For further context, these past stories help fill in the context.
Featured image: (Photographer)/Shutterstock
