# TestNet and MainNet Update: 3.8.1

**URL:** <https://forum.algorand.co/t/testnet-and-mainnet-update-3-8-1/7380>\
**Category:** Announcements\
**Tags:** testnet, mainnet\
**Created:** [July 9, 2022, 3:01pm UTC](https://forum.algorand.co/t/testnet-and-mainnet-update-3-8-1/7380 "2022-07-09T15:01:15Z")\
**Posts on this page:** 1\
**Showing post:** 1

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**Author:** ![johnlee](https://avatars.discourse-cdn.com/v4/letter/j/54ee81/32.png) [@johnlee](https://forum.algorand.co/u/johnlee)\
**Post date:** [July 9, 2022, 3:01pm UTC](https://forum.algorand.co/t/testnet-and-mainnet-update-3-8-1/7380/1 "2022-07-09T15:01:15Z")

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MainNet and TestNet were updated to 3.8.1 Fri Jul 8, 2022 9:00PM EDT (1:00AM +1d UTC).

 ![GitHub Logo](https://us1.discourse-cdn.com/flex016/uploads/algorand/original/1X/fcd756bba61094f9e8774e43ec402e311aeea50e.jpeg)

# Overview

Remove prefetch optimization.

# Changelog

## Bugfix

- Ledger: Disable resource prefetch optimization

## Protocol Upgrade

This release does not contain a protocol upgrade.

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## Additional Resources

- [Algorand Forum](https://forum.algorand.co)
- [Developer Documentation](https://developer.algorand.org)

To update your current version, run the following goal command: `./update.sh -c stable -i -d <data-directory> -n` If you haven’t already done so, we also advise setting up a CRON job to automatically update your algorand networks. If you haven’t done this yet, you can follow the instructions here: [Install a node - Algorand Developer Portal](https://developer.algorand.org/docs/run-a-node/setup/install/#updating-node)

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