Network Upgrades
Blockchain networks periodically upgrade their protocol. Most upgrades do not affect CRE workflows, but some change how transactions are priced or executed. This page tracks upcoming upgrades that may require action from workflow developers.
Ethereum Glamsterdam
Ethereum is upgrading to Glamsterdam during Q4 2026. The Ethereum Sepolia upgrade took place on 6 October 2026 at 13:53:36 UTC. Ethereum Hoodi and Mainnet activation dates are still to be confirmed.
Glamsterdam changes the gas model of the chain. You do not need to do anything unless your workflow sets a gas limit, in which case see Preparation below.
Timelines
| Network | Timing | Impact |
|---|---|---|
| Ethereum Sepolia | 6 October 2026, 13:53:36 UTC (completed) | Workflows writing to Ethereum Sepolia may have failed 30 minutes before and after the upgrade. |
| Ethereum Hoodi | To be confirmed (26 October 2026 activation postponed) | Workflows writing to Ethereum Hoodi may fail 30 minutes before and after the upgrade. |
| Ethereum Mainnet | To be confirmed | Workflows writing to Ethereum Mainnet may fail 30 minutes before and after the upgrade. |
Preparation
If your workflows set a gas limit, you may need to adjust it once the hardfork takes effect. The new gas limit value depends on how much storage versus compute your transactions use, so we cannot advise on how to adjust your limits.
To best prepare:
- For Ethereum Sepolia, if your workflows wrote to Sepolia around the 6 October 2026 upgrade, confirm their transactions still succeed. If you still have a gas limit set and your transactions are reverting due to out of gas, increase your gas limit well above the previous Fusaka limit of 16,777,216.
- Ahead of the Ethereum Hoodi and Mainnet upgrades (dates to be confirmed), apply the same steps as Ethereum Sepolia: add extra gas headroom or unset the gas limit, and confirm your workflows still succeed.
For details on configuring gas limits in your workflows, see Configuring gas limits and Writing data onchain.
Learn more
- Supported Networks — Networks available for simulation and production
- Writing Data Onchain — Configure gas limits for onchain writes
- Release Notes — What's new in CRE