Google December 2025 Core Update

Google’s December 2025 core update began rolling out on 11 December 2025 and completed on 29 December 2025, an 18-day rollout. It was the third broad core update of 2025, following the March and June updates. A general spam update in August had run without Google naming a target, leaving December as the year’s final broad quality recalibration.

What changed

The December update produced a pattern that stood out from its predecessors: informational publishers lost ground while eCommerce and transactional sites gained. Analysis from SISTRIX showed that the winning categories were dominated by apparel, retail, real estate, and sports and fitness sites, with established commercial brands performing strongly.

Separately, pages designed to serve a single, clear user intent consistently outperformed pages attempting to satisfy multiple intents simultaneously. Mixed informational-commercial pages, a common format in affiliate and comparison content, were among the harder-hit formats.

Notable losers

Wikipedia was the largest single loser of the update by absolute visibility points, falling from 8,232.28 to 7,775.59 in SISTRIX UK data, a drop of 456.69 points. In percentage terms that is 5.55%. The absolute figure is large because Wikipedia’s visibility base is large, not because the site was heavily demoted.

Major UK and US news publishers also saw sharp visibility declines, including The Guardian, The Telegraph, The New York Times, and The Independent. Press Gazette reported that The Times and Substack were among the few UK publishers to see gains. The pattern was broad enough across news to suggest a directional signal rather than individual site issues.

Health, medical, and personal finance publishers saw continued YMYL-category volatility consistent with earlier 2025 updates.

Notable winners

Thesaurus.com was the largest absolute winner, rising from 228.44 to 283.99 visibility points, a gain of 55.55 points or 24.32%. Trustpilot gained 38.73%, from 81.22 to 112.68. Oxford Learner’s Dictionaries took third place on absolute gain at 22.26%. The pattern of wins was concentrated in sites with clear utility and a well-defined single purpose.

SISTRIX attached a qualifier to their own analysis: domains from health, finance, reference, travel and adult categories appear on both the winning and losing lists. At sector level the update reshuffled positions within categories rather than promoting or demoting whole verticals.

ECommerce and transactional categories performed strongly overall, suggesting the update may have improved how Google differentiates between informational and commercial intent, routing commercial queries more reliably to commercial destinations.

The intent focus

The clearest practical signal from the December update is the value of intent specificity. Sites that try to be both an informational resource and a conversion-oriented commercial page on the same URL face an increasingly difficult challenge. The update appeared to reward pages that fully commit to serving one type of user need, and to penalise pages that hedge between multiple goals.

What this means

For sites affected by the December update, the diagnostic starting point is intent clarity. Review whether your pages are designed around what the user wants to accomplish at that specific moment, or whether they mix informational depth with commercial calls to action in ways that create ambiguity about the page’s purpose.

For publishers who saw drops, the underlying question is more complex: whether the content delivers something users cannot get as easily from an AI Overview or synthesised answer, and whether there is a sufficiently specific audience that actively seeks it out.

• Started: 11 December 2025
• Completed: 29 December 2025
• Duration: 18 days
• Type: Broad core
• Confirmed by: Google Search Status Dashboard

Sources

• Google Releases December 2025 Core Update — Search Engine Journal
• Google December 2025 Core Update rollout complete — Search Engine Land
• Google December 2025 Core Update — SISTRIX
• Times among few UK winners — Press Gazette
• Google Search Status Dashboard — Ranking Updates