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Teku

Consensys · Java · Apache-2.0

Java consensus client with combined or split BN/VC modes.

consensusvalidatorEthereum MainnetHoodiSepoliaHoleskyEphemery
Consensys/tekuDocsWebsiteconsensys/teku

Required by network upgrades

UpgradeNetworkMinimum
GlamsterdamSepolia≥ 26.9.1
FusakaEthereum Mainnet≥ 25.11.1

Releases

Rated by the teku-notes rules · weight 1.5
Channel
Severity
Type
Network
Fork
32 releases
Teku26.10.2
Why this rating
  • high (hoodi): 26.10.2 This is a REQUIRED update for Hoodi network.
  • low (all networks): This is an optional update for other networks containing improvements and bugfixes.
Oct 22, 2026
Teku26.10.1
Why this rating
  • high (hoodi): This is a required update for Hoodi Glamsterdam fork (epoch 132352, which is 26 Oct 2026 17:42:48 UTC).
  • fork scheduled (hoodi): This is a required update for Hoodi Glamsterdam fork (epoch 132352, which is 26 Oct 2026 17:42:48 UTC).
  • fork scheduled (hoodi): - Scheduled Gloas fork for the HOODI network at epoch 132352, which is 26 Oct 2026 17:42:48 UTC.
  • medium (all networks): 26.10.1 This is a recommended update containing improvements and bugfixes.
Oct 15, 2026
Teku26.10.0
Why this rating
  • medium (all networks): 26.10.0 This is a recommended update containing improvements and bug fixes.
Oct 8, 2026
Teku26.9.1
Why this rating
  • high (sepolia): This is a required update for the Sepolia network for the upcoming Glamsterdam (Gloas) fork at epoch 353024 (October 6, 2026 13:53:36 UTC).
  • fork scheduled (sepolia): This is a required update for the Sepolia network for the upcoming Glamsterdam (Gloas) fork at epoch 353024 (October 6, 2026 13:53:36 UTC).
  • fork scheduled (sepolia): - Scheduled the Glamsterdam (Gloas) upgrade on Sepolia for epoch 353024 (October 6, 2026 13:53:36 UTC).
  • medium (all networks): 26.9.1 This is a recommended update containing improvements and bugfixes.
Sep 28, 2026
Teku26.9.0
Why this rating
  • medium (all networks): 26.9.0 This is a recommended update containing bug fixes and breaking changes.
  • Breaking changes: - Promoted --Xvalidators-external-signer-concurrent-limit to non-experimental --validators-external-signer-concurrent-limit, and imposed maximum limit of 1024 …
Sep 17, 2026
Teku26.8.0
Why this rating
  • medium (all networks): 26.8.0 This is a recommended update containing bug fixes and breaking changes.
  • Breaking changes: - Removed the legacy web3j-based Eth1/PoW deposit-log fetching. A node no longer requires an Eth1 JSON-RPC endpoint to run; deposits are sourced from the final…
  • deprecation wording: "- Removed the GetDepositSnapshot RPC endpoint, which has been deprecated and removed since v3.0.0 of the Beacon API spec."
Aug 10, 2026
Teku26.7.1
Why this rating
  • medium (all networks): 26.7.1 This is a strongly recommended update containing security fixes
  • security wording: "26.7.1 This is a strongly recommended update containing security fixes"
Jul 11, 2026
Teku26.7.0
Why this rating
  • medium (all networks): 26.7.0 This is a recommended update containing the QUIC p2p protocol.
  • Breaking changes: * Windows is no longer supported. * JDK 25 required from v26.6.0.
Jul 1, 2026
Teku26.6.1
Why this rating
  • medium (all networks): 26.6.1 This is a recommended update containing improvements and security fixes.
  • security wording: "26.6.1 This is a recommended update containing improvements and security fixes."
  • Breaking changes: JDK 25 is now required. Please update to JDK 25, or your node will fail to start up.
  • performance wording: "- Make sure sync committee duties are retried while the EL is optimistic."
Jun 16, 2026
Teku26.6.0
Why this rating
  • medium (all networks): 26.6.0 This is a recommended update containing JDK25, security fixes, and general improvements.
  • security wording: "26.6.0 This is a recommended update containing JDK25, security fixes, and general improvements."
  • Breaking changes: JDK 25 now is now required. Please update to JDK 25, or your node will fail to start up.
  • performance wording: "- Make sure sync committee duties are retried while the EL is optimistic."
Jun 15, 2026
Teku26.4.0
Why this rating
  • deprecation wording: "* Added deprecation warning on startup for any leveldb database types."
Mar 31, 2026
Teku26.3.0
Why this rating
  • high (mainnet): 26.3.0 This is a mandatory update containing the fix for recent mainnet beacon state serialization issue as well as performance improvements and library updates.
  • performance wording: "26.3.0 This is a mandatory update containing the fix for recent mainnet beacon state serialization issue as well as performance improvements and library updates."
Mar 5, 2026
Teku26.2.0
Why this rating
  • medium (all networks): 26.2.0 This is a recommended update containing improvements and bug fixes.
  • Breaking changes: - Removed development cli arg --Xp2p-reworked-sidecar-recovery-enabled.
  • performance wording: "If you experience high CPU usage affecting validator duty performance, you can:"
Feb 11, 2026
Teku25.12.0
Why this rating
  • medium (all networks): 25.12.0 This is a recommended release update containing bug fixes and improvements.
Dec 16, 2025
Teku25.11.1
Why this rating
  • Breaking changes: * jdk 24 docker image build has been removed in favour of jdk 25 docker image build.
  • low (all networks): 25.11.1 This is an optional update containing improvements and bug fixes.
Nov 23, 2025
Teku25.11.0
Why this rating
  • high (mainnet): 25.11.0 ⚠️ This is a required update for mainnet for the upcoming Fulu upgrade! ⚠️
  • fork scheduled (mainnet): - 🚀 Added mainnet configuration for the Fulu fork 🦓 due at epoch 411392, December 3, 2025, 09:49:11pm UTC
Nov 4, 2025
Teku25.10.0
Why this rating
  • medium (all networks): It is recommended for all Testnets.
  • Breaking changes: - GOSSIP_MAX_SIZE, MAX_CHUNK_SIZE, TTFB_TIMEOUT and RESP_TIMEOUT configuration variables are no longer exported as they were removed from spec. Any release com…
  • low (mainnet): 25.10.0 This is an optional update for Mainnet.
Oct 23, 2025
Teku25.9.3
Why this rating
  • fork scheduled (holesky): - Holesky fork at epoch 165120 (2025-10-01 08:48:00 UTC)
  • fork scheduled (sepolia): - Sepolia fork at epoch 272640 (2025-10-14 07:36:00 UTC)
  • fork scheduled (hoodi): - Hoodi fork at epoch 50688 (2025-10-28 18:53:12 UTC)
  • low (mainnet): 25.9.3 This is an optional update for Mainnet.
Sep 24, 2025
Teku25.9.2
Why this rating
  • hotfix wording: "25.9.2 This is a hotfix release targeting an issue with 25.9.1."
  • low (all networks): For all other operators, it is an optional upgrade.
Sep 9, 2025
Teku25.9.1
Why this rating
  • medium (all networks): Further information is available at If you are on a Debian/Ubuntu system with Grafana installed, this is likely to affect you and you should upgrade to 25.9.1.
  • hotfix wording: "25.9.1 This is a hotfix release targeting an issue with 25.9.0."
Sep 3, 2025
Teku25.9.0
Why this rating
  • low (all networks): 25.9.0 This is an optional update containing bug fixes and improvements.
Sep 2, 2025
Teku25.7.1
Why this rating
  • Breaking changes: - Removed --validators-proposer-blinded-blocks-enabled unused option. This option is not used anymore and should be removed from any config
  • low (all networks): 25.7.1 This is an optional update containing bug fixes and improvements.
Jul 27, 2025
Teku25.6.0
Why this rating
  • medium (all networks): This is a recommended update containing bug fixes and performance improvements.
  • Breaking changes: - Previous versions of Teku will not be able to read the configuration from this version of Teku (including VC) due to the defaulting of BPO configuration to a…
  • deprecation wording: "- The --validators-proposer-blinded-blocks-enabled is deprecated and will be removed."
  • performance wording: "This is a recommended update containing bug fixes and performance improvements."
Jun 30, 2025
Teku25.5.0
Why this rating
  • medium (all networks): 25.5.0 This is a recommended update containing bug fixes and performance improvements.
  • Breaking changes: - Previous versions of Teku will not be able to read the configuration from this version of Teku (including VC) due to the addition of BPO configuration.
  • performance wording: "25.5.0 This is a recommended update containing bug fixes and performance improvements."
May 28, 2025
Teku25.4.1
Why this rating
  • high (mainnet): 25.4.1 This is a required update for Mainnet, Gnosis, and all electra enabled networks.
  • fork scheduled (mainnet): Mainnet Electra activation will happen at epoch 364032 (May 7, 2025, 10:05:11am UTC).
  • fork scheduled (mainnet): - Scheduled Electra for Mainnet at epoch 364032 (May 7, 2025, 10:05:11am UTC)
  • Breaking changes: - It is no longer possible to set both --checkpoint-sync-url and --initial-state. If your node fails to start after upgrade, ensure that only one of these is s…
Apr 17, 2025
Teku25.4.0
Why this rating
  • medium (all networks): It is a recommended update containing bug fixes and performance improvements for all Testnets (already running on Electra).
  • low (mainnet): 25.4.0 This is an optional update for Mainnet users.
  • performance wording: "It is a recommended update containing bug fixes and performance improvements for all Testnets (already running on Electra)."
Apr 2, 2025
Teku25.3.0
Why this rating
  • high (hoodi): 25.3.0 This is a required update to run Hoodi testnet.
  • Breaking changes: - --logging CLI option has been modified to specify only the logging level of Teku classes and related dependencies (discovery, lipb2p). Logging level of other…
Mar 20, 2025
Teku25.2.0
Why this rating
  • high (sepolia, holesky): This is a required update for nodes running on Holesky or Sepolia network as it contains the configuration for the Electra hard fork.
  • Breaking changes: - Removed MAX_CHUNK_SIZE from network global configurations, which will mean older clients will not get it from newer versions of Teku.
  • low (mainnet): 25.2.0 This is an optional update for Mainnet nodes, containing improvements to the client.
  • deprecation wording: "- Deprecated beacon-api /eth/v1/config/deposit_contract - will be removed after electra, in the fulu timeframe."
Feb 12, 2025
Teku25.1.0
Why this rating
  • Breaking changes: - --Xvalidators-builder-registration-default-gas-limit CLI option has been replaced by --validators-builder-registration-default-gas-limit - --Xp2p-sync-rate-l…
  • low (all networks): 25.1.0 This is an optional update containing upgrades to metrics and other improvements.
  • performance wording: "- Optimized blobs validation pipeline"
Jan 22, 2025
Teku24.12.1
Why this rating
  • medium (all networks): 24.12.1 This is a recommended update containing bug fixes
Dec 18, 2024
Teku24.12.0
Why this rating
  • medium (all networks): 24.12.0 This is a recommended update containing bug fixes and security updates.
  • performance wording: "- Improved block publishing performance, especially relevant with locally produced blocks"
Dec 12, 2024
Teku24.10.3
Why this rating
  • medium (all networks): 24.10.3 This is a recommended update with bug fixes and networking improvements.
Oct 28, 2024
Teku releases and hard fork readiness · stakestack