Google announced the Google December 2025 core update on Thursday afternoon, December 11th, and it already has a significant impact on Google Search results. The most noticeable day of the impact was Saturday, December 13th, but there are plenty of signs it started to hit hard on Friday, December 12th.
Here is a recap of what happened in the search forums today...
John Mueller from Google had Danny Sullivan from Google on the Search Off the Record podcast to talk about "Thoughts on SEO & SEO for AI." In short, they both said SEO for AI is the same as SEO for traditional search but then they got into it.
Google updated its JavaScript SEO best practices document with a new section on how to set the canonial URL when using JavaScript. Google wrote, "The best way to set the canonical URL is to use HTML, but if you have to use JavaScript, make sure that you always set the canonical URL to the same value as the original HTML."
Google is bringing Gemini 3 Flash to AI Mode, bringing much of Gemini 3's power without waiting too long - hence the "Flash" part of the name. Robby Stein from Google said, "Starting today, we’re rolling it out globally in Search as the default model in AI Mode."
Back in October, many businesses reported that reviews left on their Google Business Profiles were disappearing. It wasn't happening to every business, but it was widespread. Last night, I was told the bug had been fixed and that the reviews should be returning.