Chainstack - Scheduled urgent protocol upgrade - Arbitrum – Maintenance details

System Under Maintenance

Scheduled urgent protocol upgrade - Arbitrum

Completed
Scheduled for November 27, 2025 at 10:00 PM – November 28, 2025 at 2:00 AM

Affects

Chainstack Console

Under maintenance from 10:00 PM to 2:00 AM

Arbitrum Global Nodes

Under maintenance from 10:00 PM to 2:00 AM

Arbitrum One Mainnet

Under maintenance from 10:00 PM to 2:00 AM

Arbitrum Sepolia

Under maintenance from 10:00 PM to 2:00 AM

Arbitrum Trader Nodes

Under maintenance from 10:00 PM to 2:00 AM

Arbitrum One Mainnet Archive (Chainstack Cloud, Frankfurt)

Under maintenance from 10:00 PM to 2:00 AM

Updates
  • Completed
    November 28, 2025 at 2:00 AM
    Completed
    November 28, 2025 at 2:00 AM
    Maintenance has completed successfully
  • In progress
    November 27, 2025 at 10:00 PM
    In progress
    November 27, 2025 at 10:00 PM
    Maintenance is now in progress
  • Planned
    November 27, 2025 at 10:00 PM
    Planned
    November 27, 2025 at 10:00 PM

    Upgrade Details: We will upgrade the protocol Arbitrum to version 3.9.3, as part of implementing ArbOS 51

    What to expect:

    • The upgrade process is expected to take approximately 4 hours

    • During this period, there may be temporary disruptions or degraded performance

    • No action is required on your end, our team will handle the upgrade seamlessly

    We will be closely monitoring the process to ensure a smooth transition and will provide updates as needed. Thank you for your patience and support!

    If you have any questions, feel free to reach out at support@chainstack.com