Network upgrade overview
This page provides hardfork activation timestamps and links to detailed specifications. The documentation outlines the hardfork release process. The network upgrade naming scheme after the Bedrock upgrade follows a geology theme based on the next letter in the English alphabet.Activations
Network upgrades are activated by timestamps. Failing to upgrade your OP Stack software before the timestamp will cause a chain divergence and you will need to resync the chain. Optimistic activation times refer to times that are pending governance approval.| Upgrade | Governance Approval | Mainnet Activations | Sepolia Activations |
|---|---|---|---|
| Isthmus | approved | Fri May 9 16:00:01 UTC 2025 (1746806401) | Thu Apr 17 16:00:00 UTC 2025 (1744905600) |
| Holocene | approved | Thu Jan 9 18:00:01 UTC 2025 (1736445601) | Tue Nov 26 15:00:00 UTC 2024 (1732633200) |
| Granite | approved | Wed Sep 11 16:00:01 UTC 2024 (1726070401) around block 125235812 | Mon Aug 12 16:00:00 UTC 2024 (1723478400) around block 15837930 |
| Fjord | approved | Wed Jul 10 16:00:01 UTC 2024 (1720627201) around block 122514212 | Wed May 29 16:00:00 UTC 2024 (1716998400) around block 12597930 |
| Ecotone | approved | Thu Mar 14 00:00:01 UTC 2024 (1710374401) around block 117387812 | Wed Feb 21 17:00:00 UTC 2024 (1708534800) around block 8366130 |
| Delta | approved | Thu Feb 22 00:00:00 UTC 2024 (1708560000) around block 116480612 | Fri Dec 22 00:00:00 UTC 2023 (1703203200) around block 5700330 |
| Canyon | approved | Thu Jan 11 17:00:01 UTC 2024 (1704992401) around block 114696812 | Tue Nov 14 17:00:00 UTC 2023 (1699981200) around block 4089330 |
| Bedrock | approved | Tue Jun 06 2023 16:28:23 UTC (1686079703) at block 105235063 | N/A |
Upgrade process
Network upgrades follow this general process in which the features included in the upgrade are put into a release version cut from thedevelop branch and
then the software is deployed on production networks.
“Baking” on a network means the node software has been deployed and is live.
Engineers take this time to observe the behavior of the software on
production networks.
1
Devnet
Devnet Upgrade Notice Periodis for core developers to upgrade the node software on an internal devnet prior to the activation timestamp.Upgrade Activates on DevnetBaking on Devnet
2
Testnet
Testnet Upgrade Notice Periodis to allow testnet node operators to upgrade the node software on testnet prior to the activation timestamp.Upgrade Activates on TestnetBaking on Testnet
3
Mainnet
Governance Voting Review Periodis when the Optimism Collective’s governance system reviews proposals, including network upgrade proposals.Governance Voting Periodis when the Optimism Collective’s governance system votes on proposals.Veto Periodis when the Citizens’ House of the governance system can veto a protocol upgrade that has been approved by the Token House.Cut Mainnet ReleaseMainnet Upgrade Notice Periodis to allow mainnet node operators to upgrade the node software on mainnet prior to the activation timestamp.Upgrade Activated
More information
- To check for the latest node software, see the Software Releases.
- For more information on the governance process see the governance documentation.