Network Incident History
A running log of substantive incidents and scheduled upgrades affecting Base Mainnet and Base Sepolia. Procedural status pings are omitted. Entries are newest first.
2026-06-02 — Mainnet Flashblocks broadcasting degraded
Section titled “2026-06-02 — Mainnet Flashblocks broadcasting degraded”On Tuesday, June 2nd at 22:32 UTC, the team began investigating periodic instability in Flashblocks broadcasting on Base Mainnet. Pre-confirmation delivery was affected, but transaction inclusion in sealed blocks was reported as unaffected throughout.
2026-05-29 — Mainnet withdrawal delay (TEE enclave)
Section titled “2026-05-29 — Mainnet withdrawal delay (TEE enclave)”On Friday, May 29th at 15:55 UTC, Base Mainnet withdrawals began running late after a TEE enclave fault stopped output proposals from being posted. The issue was identified and a fix was reported in progress; withdrawals resume once proposals catch back up.
2026-05-28 — Mainnet Azul upgrade (scheduled)
Section titled “2026-05-28 — Mainnet Azul upgrade (scheduled)”Base Mainnet activates the Azul hardfork on Thursday, May 28th at 18:00 UTC. Node operators must run version 0.9.0 or later of github.com/base/base, with corresponding preconfigured binaries published as the v0.16.0 release of github.com/base/node. From this upgrade onward, base-consensus and base-reth-node are the only supported clients — op-node and op-geth will not follow the new chain. Pending withdrawals will be invalidated by the upgrade; users with in-flight withdrawals will need to submit a second proof transaction afterward to complete them. Migration steps are documented in Base v1 upgrade.