# Core Update

> Major algorithm updates affecting broad ranking systems.

Source: https://anotherseoguru.com/en/glossary/core-update

Core updates are significant changes to Google's main ranking algorithm, typically announced and named by release date (e.g., 'March 2025 Core Update'). They can cause large ranking fluctuations and usually complete over 2 weeks.

## Example

A core update might promote sites with strong E-E-A-T while demoting those with thin content or poor user experience.

## How to apply it

Focus on overall site quality, E-E-A-T signals, content depth, and user satisfaction. There's no 'fix' for core updates - improve broadly.

> **Pro tip:** Core update recovery can take until the next core update. Use the time between to make substantial quality improvements.

## Related terms

- [Algorithm Update](https://anotherseoguru.com/en/glossary/algorithm-update)
- [E-E-A-T](https://anotherseoguru.com/en/glossary/e-e-a-t)
- [Ranking Volatility](https://anotherseoguru.com/en/glossary/ranking-volatility)