Upgrades and migrations

Learn about recent upgrades, breaking changes, and migrations in the ZKsync ecosystem here. For more details, you can check out the CHANGELOG.md and releases for the zksync-era repository.

2024

September 2024

Shared Bridge Upgrade – Friday, Sept 6

• We will be introducing a minor change to the BridgeHub contracts which allows the Admin role to add custom base tokens to the system. Previously only the owner of the contract was able to do this.
• The upgrade is a required step to distinguish the owner and admin role.

August 2024

Shared Bridge Upgrade – Monday, Aug 26

• We introduced an admin role in the Shared Bridge contract to advance toward decentralized governance.
• The admin is exclusively responsible for nominating L2 bridge counterparts for newly deployed chains.

Elastic Chain 24.2 Upgrade - Tuesday, Aug 6

• Introduces the new ChainAdmin contract interface, which has admin rights over:
  • ZKsync Era Diamond Proxy
  • BridgeHub
  • State Transition Manager
• ChainAdmin acts as a “sovereign” wrapper, allowing each ZK Chain to customize configurations like fee parameters and upgrade processes.
• The State Transition Manager (STM) contract now emits events with more detailed upgrade data accessible to other ZK Chains.
• Please note: Version 24.2 is a patch upgrade, serving as a precursor to the upcoming governance upgrades.