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Base evolves through named network upgrades. Each release introduces protocol changes, new features, or parameter updates that activate across Base Sepolia and Base Mainnet. A month without a confirmed activation timestamp is a planning target and may change.
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Planning

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Denim

Denim introduces native account abstraction with EIP-8130, allowing smart accounts to send ordinary transactions with no bundlers or relays.
  • Base Sepolia: TBD
  • Base Mainnet: TBD
View Features
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Planning

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Cobalt

Cobalt introduces native blocks at a 200ms cadence, improves the B20 token standard, and introduces dynamic node upgrades.
  • Base Sepolia: Targeting late October 2026
  • Base Mainnet: Targeting late October 2026
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Live

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Beryl

Beryl makes Base a first-class issuance platform with B20 tokens, reduces withdrawal delays, and adopts Reth V2 as the reference execution client.
  • Base Sepolia: Activated June 18, 2026
  • Base Mainnet: Activated June 25, 2026
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Live

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Azul

Azul is Base’s first independent network upgrade. It strengthens security and decentralization, advances the path to 1 gigagas per second, and improves the developer experience.
  • Base Sepolia: Activated April 20, 2026
  • Base Mainnet: Activated May 28, 2026
View Features

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Upstream OP Stack Hardforks

Base adopted the following upstream OP Stack hardforks. Entries are ordered by Base Mainnet activation date.
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Live

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Jovian

Jovian introduces a configurable minimum base fee and a data availability footprint gas scalar for improved fee-market stability.
  • Base Sepolia: Activated November 19, 2025
  • Base Mainnet: Activated December 2, 2025
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Live

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Isthmus

Isthmus incorporates Ethereum Pectra EIPs and introduces the operator fee mechanism for sequencer revenue.
  • Base Sepolia: Activated April 17, 2025
  • Base Mainnet: Activated May 9, 2025
View Features
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Live

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Holocene

Holocene introduces dynamic EIP-1559 parameters configurable through SystemConfig and stricter block derivation rules.
  • Base Sepolia: Activated November 26, 2024
  • Base Mainnet: Activated January 9, 2025
View Features
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Live

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Granite

Granite adds bn256Pairing precompile input-size restrictions and updates the channel timeout parameter.
  • Base Sepolia: Activated August 12, 2024
  • Base Mainnet: Activated September 11, 2024
View Features
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Live

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Fjord

Fjord introduces FastLZ-based L1 fee estimation, the RIP-7212 secp256r1 precompile, and Brotli channel compression.
  • Base Sepolia: Activated May 29, 2024
  • Base Mainnet: Activated July 10, 2024
View Features
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Live

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Ecotone

Ecotone integrates Ethereum Dencun changes, including EIP-4844 blob transactions and EIP-4788 beacon block roots.
  • Base Sepolia: Activated February 21, 2024
  • Base Mainnet: Activated March 14, 2024
View Features
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Live

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Delta

Delta introduces span batches to reduce L1 data costs by compressing multiple L2 blocks into a single batcher transaction.
  • Base Sepolia: Activated December 22, 2023
  • Base Mainnet: Activated February 22, 2024
View Features
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Live

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Canyon

Canyon brings Ethereum Shanghai EIPs, including EIP-3651, EIP-3855, and EIP-3860, to the Base execution layer.
  • Base Sepolia: Activated November 14, 2023
  • Base Mainnet: Activated January 11, 2024
View Features

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Other Changes

The configuration changelog tracks network parameter changes that do not belong to a specific upgrade.