3 Major SEO Changes in 2025 and How To Optimise in 2026
December 28, 2025
3 Major SEO Changes in 2025 and How To Optimise in 2026
SEO is shifted drastically in 2025 given the Google Search became more AI-led, more volatile during major updates, and more demanding about content quality, trust and technical foundations. If you relied on “set and forget” SEO, 2025 likely felt bumpy. If you built genuinely helpful pages with strong UX and clear authority signals, you probably saw steadier performance.
Below is a summary of the major SEO changes that shaped the search landscape in 2025 and what businesses should prioritise going forward in 2026.
1. Increased volatility from Google algorithm updates
In 2025, Google confirmed three Core Updates and one Spam Update. For Australian sites, these rollouts were often accompanied by visible ranking movement across service pages, blogs, and ecommerce category pages. According to Google’s Search Status Dashboard, the confirmed updates were: March 2025 Core Update (from 13 Mar), June 2025 Core Update (from 30 Jun), August 2025 Spam Update (from 26 Aug) and December 2025 Core Update (from 11 Dec). status.search.google.com
What this meant in practice:
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“Thin” pages that only existed to rank (without real value) became less reliable.
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Sites with messy architecture, duplicate metadata, or weak internal linking struggled to consolidate authority.
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Recovery became less about quick fixes and more about improving overall site quality and satisfaction signals.
Google also reiterates that smaller, ongoing improvements can shift rankings outside major core update windows, so the best strategy remains building quality continuously, not reacting once a quarter. Google for Developers+1
What to do:
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Track performance by page type (service pages, blog, case studies, location pages) so you can diagnose impacts quickly.
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Strengthen internal linking to help Google understand page importance and topical clusters.
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Regularly refresh your highest value pages (services and top landing pages) so they stay current and competitive.
2. AI Overviews continued to change click behaviour
Google introduced AI Overviews in Australia in late 2024, and the downstream impact became clearer throughout 2025: more queries were answered directly on the results page, which can reduce the need to click. blog.google+1
In October 2025, the ABC reported that Australian publishers were seeing meaningful declines in search traffic and readership, with data suggesting Google Search changes (including AI features) as a key contributor. ABC
The practical takeaway for businesses is not “panic”, it is adaptation:
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Informational content still matters, but it needs to be more original, more useful, and more clearly attributed to real expertise.
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“Answer-first” SERPs reward pages that are easy for systems to parse: clear headings, concise summaries, structured sections, and supportive sources.
What to do:
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Add short “definition” and “summary” sections near the top of key pages.
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Use structured headings (H2 and H3) that match real user questions.
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Strengthen trust signals: case studies, named authors, credentials, partner badges, and references where appropriate.
3. AI Mode launched in Australia and accelerated conversational search
One of the most impactful change was the rollout of Google AI Mode in Australia from 8 October 2025, positioned as a more advanced, chat-like search experience. blog.google+1
AI Mode matters because it pushes search further toward:
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Longer, more natural-language queries
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Multi-step questions
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Comparing options (“best”, “which”, “how much”, “pros and cons”)
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Higher expectations for comprehensive answers and credible sources
What to do:
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Optimise for topics, not just keywords. Build clusters that cover the full decision journey.
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Create comparison and “best fit” pages (where relevant) to capture evaluation intent.
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Ensure service pages include: who it is for, what is included, process, proof, and a clear call to action.
Final thought
To many Australian businesses, 2025 was the year SEO stopped being only about “ranking pages” and became more about “earning visibility” in a results page increasingly shaped by AI summaries and conversational search. The sites that win now are the ones that are genuinely useful, technically sound and clearly trustworthy.