CRE Notification - Ethereum Glamsterdam upgrades during Q4 2026

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Ethereum's Glamsterdam upgrade starts with Sepolia on 6 October. Check your workflow gas limits.
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Chainlink Connect (https://email.chain.link/e3t/Ctc/W3+113/d2rQJ-04/VWgRCj3hrsBMW3qLLtq49J1K_W8VsNl15VFZjWMfRflg3prCCW7Y8-PT6lZ3mkW10R0cw4FWSmbW5bgxyl7VGjj2W2nHP_M29NB5mW4dvVc37chWFpW126Bfx2yfc_2W3GnLQN7DLVn3W5772-W1WNVnyW1_NBtf1J0Rl-W4n78vx1KWXRZW4r9DVl2sKNjnW6hckZr5y9WyjN5mTD092NFC4W2RKRXl1Jrb8kN4tZkQWVSZ8sW8FF6pH8xC6XRN4DxLzCJp5j2W7T9-wh4l4ZNpN3s6gdTMDdtKW2vHtKs4l5YGlVMpPWw2Y8wCSN4J5cQSShV0QW4t_6Yx7wKK6VN8NS-h0392g0W2B2Hmg5V8hyKW3ksJPb976kv7W1fMhVB5fVPWcf2PN79K04 )

Ethereum Glamsterdam upgrade

Dear CRE Customer,

Ethereum will be upgrading to Glamsterdam (https://email.chain.link/e3t/Ctc/W3+113/d2rQJ-04/VWgRCj3hrsBMW3qLLtq49J1K_W8VsNl15VFZjWMfRflz3prCCW8wLKSR6lZ3nlW8gvmlh71JqBGW3rSBkR2twl3KW8fNcVK8z8KzJV2T1ZY3RZkX3W3DB3DC33Z7tgW85jj0C8PRcWtW6sQt3J1kgVqBW6fNlXW7BbgV3W762XLR4DDpTBW4lRpfy5Vfsf0W95gb-n43sWYzW4TZ1BW6fRM_YVQDpgz4l8n0nW9h8gnV86nfZXW3G38V73Jn_B4W7yjwrs5-q2xwW534KB05KVmjFVSslSb5x1Y6XW17MGsG8fwT3-W42fFhL2DVW-JW3QfSk46GJKHfW3blZdc3KyNDKW2J5JNb3JxFYkVPnQ6v3Rr29GW7PMH1q1CKNSJW9bmn5P5W4ZvBW6cyvZd8zv8jkW7WKQMf7wnCGyf49MvK404 (https://email.chain.link/e3t/Ctc/W3+113/d2rQJ-04/VWgRCj3hrsBMW3qLLtq49J1K_W8VsNl15VFZjWMfRflz3prCCW8wLKSR6lZ3nlW8gvmlh71JqBGW3rSBkR2twl3KW8fNcVK8z8KzJV2T1ZY3RZkX3W3DB3DC33Z7tgW85jj0C8PRcWtW6sQt3J1kgVqBW6fNlXW7BbgV3W762XLR4DDpTBW4lRpfy5Vfsf0W95gb-n43sWYzW4TZ1BW6fRM_YVQDpgz4l8n0nW9h8gnV86nfZXW3G38V73Jn_B4W7yjwrs5-q2xwW534KB05KVmjFVSslSb5x1Y6XW17MGsG8fwT3-W42fFhL2DVW-JW3QfSk46GJKHfW3blZdc3KyNDKW2J5JNb3JxFYkVPnQ6v3Rr29GW7PMH1q1CKNSJW9bmn5P5W4ZvBW6cyvZd8zv8jkW7WKQMf7wnCGyf49MvK404 ) ) during Q4 2026, starting with Sepolia on 6 October. Glamsterdam changes the gas model of the chain. You don’t have to do anything unless you have a gas limit in your workflow, in which case see below.

Ethereum Sepolia

Timing: 6 October 2026, 13:53:36 UTC

Impact: Workflows writing to Ethereum Sepolia may fail 30 mins before and 30 mins after the upgrade.

Ethereum Hoodi

Timing: Q4 2026 (date and time TBC - we’ll notify you once confirmed)

Impact: Workflows writing to Ethereum Hoodi may fail 30 mins before and 30 mins after the upgrade.

Ethereum Mainnet

Timing: Q4 2026 (date and time TBC - we’ll notify you once confirmed)

Impact: Workflows writing to Ethereum Mainnet may fail 30 mins before and 30 mins after the upgrade.

Preparation

If your workflow sets 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:

- Ahead of the Ethereum Sepolia upgrade, update your workflows to add extra gas headroom or unset the gas limit, and confirm they still succeed.
- After the Ethereum Sepolia upgrade on 6 October 2026, confirm if your workflow’s transactions still succeed. If they do, no more action is needed. 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 upgrade (date to be confirmed in Q4 2026), apply the same steps as Ethereum Sepolia to minimize impact to your workflows.

If you have any questions or concerns, please reach out to us via Telegram or create a ticket via the UI.

Thanks,

The CRE Team

Copyright © 2026 Chainlink, All rights reserved.

You are receiving this service notice because you are an organization admin on Chainlink Runtime Environment (CRE).

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George Town, Grand Cayman KY1-9012, Cayman Islands

Accession

nse/chainlinklabs/2026-10-02/3088

From

Chainlink · noreply@cre.chain.link

Sent

2 October 2026 · 17:00 UTC