Google’s SEO Alogrithm History

Google’s SEO algorithm history incomplete order from 2015 to the present time in July 2017. As you know Google uses multiple algorithms in each search query. I’ve gone out of the way to publish a list so my clients will have an understanding. A complete list of 2018 and 2021.

December 3/4 – This Google-announced core update is showing massive impacts. Early data suggests it is likely much bigger than the May 4 core update. The biggest changes were seen across the industry on December 4, 2020, but Google did not announce this update had finished rolling out until December 16, 2020

May 4, 2020: Announced Core Update. Google has told us that this update is connected to E-A-T, linking to their post on core updates. This update has affected a large number of websites strongly.

2019 Updates

June 2019 Core Update  —  June 3, 2019


Google pre-announced a “core” update, but with limited details. Sites impacted in previous core updates seem to have been affected, in some cases, and some major UK publishers reported heavy losses. On average, the impact was smaller than the August “Medic” update, as measured by MozCast.

Indexing Bugs  —  May 23, 2019


Two days in a row, Google confirmed indexing bugs. The first bug reportedly was preventing new content from being properly indexed. MozCast confirmed unusually high SERP flux from May 23-25 (peaking on the 23rd), but it’s unclear if this was directly related to the bugs.