[Runtime] RT4202 Schedule

Development Runtime upgrades
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We are planning to release Runtime 4202 in all network(s) following the schedule below:
Moonbase Alpha: March 9, 2026
Moonriver: March 30, 2026
Moonbeam: April 13, 2026

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

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Summary of Changes

Moonbeam Runtime 4202 — What it means for you

Runtimes 4201 & 4202 introduce Ethereum compatibility updates, XCM improvements, and runtime optimizations.

:star: Ethereum updates

  • Added support for the Osaka fork (EIP-7939) and additional EVM updates including EIP-7883, EIP-7823, and EIP-7825.

:warning: Breaking changes

  • MODEXP inputs are now limited to 1024 bytes. Calls exceeding this limit will fail and consume all gas.

  • Transactions with gas limits above 16,777,216 will be rejected during validation.

  • EIP-7883 increases ModExp gas costs, which may affect some contracts.

:gear: XCM updates

  • Refactored the XCM Transactor to delegate fee pricing to the XCM Weight Trader.

  • Re-enabled the UniversalOrigin XCM instruction.

:wrench: Other improvements

  • Improved fee calculations and runtime weight generation.

  • Dependency updates across Polkadot-SDK, Frontier, and Moonkit.

For full details, see the release notes:
https://github.com/moonbeam-foundation/moonbeam/releases/tag/runtime-4201

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Congratulations…it’s a start. We expect some new utility for the Glmr token.

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