Shardeum v1.1.0 Mainnet Upgrade Approved for October 13

Updated: October 9, 2026

Governance Proposal #1 has passed with 100% Yes among participating voting power. A total of 759,659,283.2 SHM in voting power supported the proposal, with no votes recorded for No, Abstain, or No with Veto.

With the proposal approved, the Shardeum v1.1.0 mainnet upgrade will proceed at block height 7,927,860, currently estimated for October 13, 2026 at approximately 06:00 UTC. The upgrade is expected to take around 1-2 hours.

You can verify the final proposal results and governance data on the Shardeum Governance Dashboard.

Validators and infrastructure providers should prepare for the v1.1.0 upgrade in advance and switch to the new binary at the specified upgrade height. Upgrade instructions are provided in the sections below.

Details of the Upgrade

What Does the Upgrade Change?

The Shardeum v1.1.0 release includes:

• Resynchronization of Shardeum EVM with upstream Cosmos EVM v0.6.3
• Security fixes previously included in Shardeum v1.0.2, carried forward into the v1.1.0 release

This means the upgrade involves both deploying updated node software and applying the corresponding state migration required for the existing Shardeum mainnet.

Why Is a Coordinated Network Upgrade Required?

Cosmos EVM v0.6.3 includes state-breaking changes, which means validators cannot independently switch to the new software while the network continues operating normally.

Instead, Shardeum will use the standard Cosmos software-upgrade process.

The upgrade will take place at block height 7,927,860. When the network reaches that height, nodes running the existing software will halt as expected. Validators will then restart their nodes using the Shardeum v1.1.0 binary containing the upgrade logic required for the new network state.

Once sufficient validator voting power is online with the upgraded software and consensus resumes, the network will continue producing blocks under the updated software.

What Do Validators and Node Operators Need to Do?

Validators and other node operators should prepare the Shardeum v1.1.0 release before the mainnet upgrade.

1. Download the appropriate v1.1.0 binary for your server from the GitHub release page below.
2. Verify the downloaded binary against the published SHA-256 checksum.
3. Keep the new binary ready, but do not run v1.1.0 before the network reaches upgrade height 7,927,860.
4. Continue running your current mainnet release until the network halts at the upgrade height.
5. Once the network halts, start your node using v1.1.0.
6. Confirm that your node resumes syncing and operating normally after the upgrade.

Binaries and Checksums

• Binaries: v1.1.0 GitHub release
• Linux x86_64: shardeumd-v1.1.0-linux-amd64 (SHA-256: 08cf7e6a7381bc8ffabaf265a2571304353409d85a7504f3d96fcfb0b2240f89)
• Linux ARM64 / aarch64: shardeumd-v1.1.0-linux-arm64 (SHA-256: 21a5d20da3227f2cff5f61d4c1abbca82450f4a226448135da898e00e8fd62a7)
• Docker: Use the Docker image pinned by digest on the v1.1.0 release page.
• Cosmovisor: If you use Cosmovisor, the upgrade name must match exactly: v0.4.0-to-v0.6.3

Important

• Do not start v1.1.0 before the upgrade height. Running a mismatched version before the coordinated upgrade can cause the node to crash.
• The upgrade is triggered by block height rather than a fixed clock time, so the estimated October 13, ~06:00 UTC upgrade time and related timings may shift. Node operators should be online and ready before the estimated upgrade time.
• For live upgrade coordination, join the Shardeum Discord coordination channel.

Information for Exchanges and Infrastructure Providers

Exchanges, RPC providers, indexers, custodians, bridges, and other infrastructure operators running Shardeum nodes should also prepare for the upgrade in advance. We recommend them to be online and ready before the estimated upgrade time.

Further, Shardeum recommends that exchanges temporarily suspend SHM deposits and withdrawals beginning approximately at 02:00 UTC on October 13, 2026, ahead of the scheduled network upgrade.

Deposits and withdrawals should resume only after:

• Their Shardeum node has been upgraded
• The node is fully synced with mainnet
• Normal network operation has been confirmed

Additional coordination details will be shared directly with infrastructure partners ahead of the upgrade.

What Does This Mean for Shardeum Users?

Regular Shardeum users do not need to take any action for the software upgrade.

When Shardeum reaches the scheduled upgrade height, the network will temporarily halt as part of the planned upgrade process while validators transition to the new software. During this period, transactions and applications using Shardeum will temporarily be unavailable.

The upgrade is currently estimated to begin around October 13, 2026 at 06:00 UTC. Once sufficient validator voting power is online with the upgraded software and consensus resumes, the network will begin producing blocks again. Network operations are expected to resume later the same day, subject to the upgrade progressing as planned.

Shardeum will confirm once the upgrade has been successfully completed and normal network operations have resumed.