Google Core Updates Explained: What Site Owners Should Know

Google regularly rolls out core updates, meaning changes to its search ranking algorithm. Some are bigger than others, and all of them aim to gradually improve search results. In August 2019, Google published guidance explaining what these updates are and how site owners should respond. Here’s what you need to know about Google core updates.

What Is a Core Update?

As Google’s Danny Sullivan explained in a post on the Google Webmaster Central Blog, Google changes its search engine every day. Most of those changes go unnoticed, but a few, such as the March 12, 2019, core update, stand out. For those, Google makes a point of publishing announcements to give advance notice or guidance to content creators, SEO professionals, and site owners.

These announcements matter because Google knows its core updates can cause ranking changes, sometimes significant ones, depending on the site. By sharing guidance, Google helps site owners avoid fixing the wrong things or making unnecessary changes.

Core Updates Reward Quality Content

Core updates are not designed to penalize sites or reduce their visibility. A site that drops after a core update isn’t necessarily doing anything wrong; penalties are a separate matter, reserved for sites that violate Google’s guidelines. Instead, core updates aim to improve how Google assesses content overall. As a result, some pages are rightly rewarded, even though they may not have ranked as well before with the very same content.

In his post, Danny Sullivan uses a nice analogy: a list of favorite movies. Imagine you ranked your top 100 movies in 2015 and updated the list in 2019. The list would naturally change. Great new movies that didn’t exist yet would earn a spot, and you might decide some older films deserved a higher place than you first gave them. The movies that slipped down the list aren’t bad. Other, more deserving titles simply moved up.

Focus on Content Quality

Relevance and quality are Google’s watchwords. The search engine advises site owners to offer the best content they can (our SEO content writing tips can help), because that’s what its algorithms aim to reward with top positions in search results. If a site loses visibility despite your efforts, Google provides a series of questions to help you figure out what to improve. Here are a few of them, paraphrased:

• Does the content provide original information, reporting, research, or analysis?
• Does the headline or page title provide a descriptive, helpful summary of the content?
• Is the content written by an expert or enthusiast who clearly knows the topic well?
• Is the content free of spelling or grammar mistakes?
• Does the content provide substantial value compared with other pages in search results?

These questions shed light on how Google thinks. Consider having SEO specialists run an audit of your site: many other important factors should be reviewed by professionals to optimize your site effectively.

Where Things Stand in 2026

Google still announces its core updates on the Google Search Status Dashboard, and the 2019 guidance lives on in Google Search Central’s documentation on core updates. Google has kept rolling them out since, including the March 2026 core update. In March 2024, it also folded its helpful content system into its core ranking systems, which makes people-first content even more central to how core updates play out.

Need Help Improving Your Visibility on Google?

Référenceur is a French-speaking digital marketing agency from Belgium and Luxembourg that works with U.S. businesses remotely, through video calls, shared screens, and monthly reporting. If a core update has shaken your rankings, get a free assessment and we’ll help you figure out what to work on first.