[Runtime] RT430X Schedule

Development Runtime upgrades
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We are planning to release Runtime 430X in all network(s) following the schedule below:

Moonbase Alpha
Runtime: 4300
When: April 8, 2026

Moonriver
Runtime: 4300
When: May 12, 2026 at approximately 13:00:00 UTC
Block: ~ 16,249,119

Moonbeam
Runtime: 4303*
When: May 20, 2026 at approximately 13:00:00 UTC
Block: ~15,689,298

* Note: the upgrade to RT4301 is being canceled and replaced with runtime 4303.

This runtime upgrade includes several breaking changes.
See the release note for more details: Releases · moonbeam-foundation/moonbeam · GitHub

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Delegation Report - Yaron
Delegation Report - Yaron
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Summary of Changes

Moonbeam Runtime 4300 — What it means for you

Runtime 4300 upgrades Moonbeam to a newer Polkadot-SDK version and includes fixes across XCM, Ethereum RPCs, and staking.

:star: Core updates

  • Upgraded Moonbeam to Polkadot-SDK stable2512.

:warning: Notable changes

  • Unprotected Ethereum transactions are now forbidden.

  • Fixed issues with eth_getBlockByNumber("latest") returning null and improved WS RPC stability.

  • Permit deadlines are now checked in milliseconds, aligning with expected behavior.

:gear: XCM updates

  • Re-enabled the UniversalOrigin XCM instruction.

  • Fixed XCM refund logic and benchmarking issues.

:wrench: Other improvements

  • Added delegation scheduled requests summary in staking.

  • Regenerated runtime weights.

For full details, see the release notes:
https://github.com/moonbeam-foundation/moonbeam/releases/tag/runtime-4300

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Referendum 153 is up for vote to authorize an upgrade to RT4303 on Moonbeam via Whitelist so that we can keep to the schedule described above.

Community members can vote here:

https://apps.moonbeam.network/moonbeam/referendum/153

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