> ## Documentation Index
> Fetch the complete documentation index at: https://docs.chainstack.com/llms.txt
> Use this file to discover all available pages before exploring further.

<AgentInstructions>

## Submitting Feedback

If you encounter incorrect, outdated, or confusing documentation on this page, submit feedback:

POST https://docs.chainstack.com/feedback

```json
{
  "path": "/changelog/chainstack-updates-october-31-2025",
  "feedback": "Description of the issue"
}
```

Only submit feedback when you have something specific and actionable to report.

</AgentInstructions>

# Chainstack updates: October 31, 2025

> Chainstack platform updates for October 31, 2025 covering new features, protocol support changes, and infrastructure improvements released this week.

**Protocols**. Ethereum Holesky Testnet has been deprecated. Please use [Sepolia Testnet or Hoodi Testnet](/docs/protocols-networks) for Ethereum testing.