Google announced the August 2025 spam update on August 26 and marked it complete on the Search Status Dashboard on September 22, 2025, after 26 days and 15 hours. Google said the rollout "may take a few weeks to complete", and at nearly four weeks it ran unusually long for a spam update. It applied globally and to all languages, and it turned out to be the only spam update of 2025; the previous one had shipped in December 2024.
Google announced nothing unique about the target: this was a general, broad improvement to its automated spam-detection systems, of which the AI-based SpamBrain is the centerpiece per Google's spam updates documentation. Search Engine Land reported the update touched down fast, with affected sites seeing movement within roughly 24 hours of the start, followed by a second wave of ranking fluctuations around September 9. Many hit sites saw steep declines in organic visibility, while some sites hit by earlier spam updates recorded significant recoveries.
Unlike a core update, a spam update leaves something specific to check: Google's guidance for sites that see a change is to review its spam policies and fix anything that falls short. Google also cautions that improvements register only as its automated systems learn, over a period of months, that a site complies, so recovery from a spam update is measured in months rather than days.