We are planning to release Runtime 4100 in all network(s) following the schedule below:
- Moonbase Alpha upgrade: Wednesday, December 17, 2025
- Moonriver proposal: Wednesday, December 17, 2025
- Moonbeam proposal: Wednesday, January 7, 2026
- Moonriver upgrade authorized: Monday, January 5, 2026
- Moonbeam upgrade authorized: Tuesday, January 27, 2026
This runtime upgrade includes several breaking changes.
See the release note for more details: Releases · moonbeam-foundation/moonbeam · GitHub
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Moonbeam Runtime 4100 — What it means for you
This release delivers important staking UX improvements, Asset Hub readiness, and runtime cleanups, alongside a key collator configuration update.
Parachain Staking improvements
Added bounded, FIFO multi-request support for delegation scheduling, allowing delegators to queue multiple unbonding or delegation changes safely.
Reduced minimum collator candidate stake from 500k → 100k GLMR, lowering the barrier to become a collator and improving decentralization.
Asset Hub–ready cross-chain execution
Updated XCM Transactor to fully support the Asset Hub migration, ensuring smooth remote execution and staking operations post-migration.
Additional upgrades include:
Fixed gas calculation issues in the Collective precompile
Removed legacy multi-block and lazy migrations from parachain staking
Replaced deprecated consensus converters with the new ExternalConsensusLocationsConverterFor
Upgraded to Polkadot SDK stable2506 for improved stability and forward compatibility
Breaking change:
- Storage layout update in
pallet-parachain-staking:
DelegationScheduledRequests moved from a single StorageMap (by collator) to a StorageDoubleMap keyed by (collator, delegator).
→ Indexers and dApps querying staking schedules must update accordingly.
Client requirement:
- Collators must upgrade to client v0.49.0 before Runtime 4100 is enacted.
No gas or ABI changes for EVM contracts—this release focuses on staking flexibility, cleaner runtime state, and long-term cross-chain readiness.
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Proposal for Moonriver RT4100 is up! Authorize Upgrade for Moonriver to RT4100 | Polkassembly
Estimated enactment of Moonriver will take place on Tuesday 6th of January 13:00 UTC, at approx 14,629,541 block height.
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Moonriver RT4100 has been successfully enacted!
As we need to urgently fix the bug, we’ve cancelled the MB RT4101 proposal and created a new one with a patched binary. Please vote here: Referendum 144 | Governance - Moonbeam dapps
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Estimated enactment of Moonbeam will take place on Tuesday, January 30, 13:00 UTC, at approx 14,274,578 block height.
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