Caplin (Erigon embedded CL)
betaErigon Technologies · Go · LGPL-3.0
Consensus client embedded in Erigon; releases follow Erigon.
consensusEthereum MainnetHoodiSepolia
Required by network upgrades
| Upgrade | Network | Minimum |
|---|---|---|
| Glamsterdam | Sepolia | ≥ 3.7.1 |
| Fusaka | Ethereum Mainnet | ≥ 3.3.0 |
Releases
32 releases
Caplin (Erigon embedded CL)v3.8.1
Why this rating
- high (hoodi): Hoodi operators running 3.8.0 must upgrade before 26 October 2026, 17:42:48 UTC.
- high (hoodi): Hoodi nodes on 3.8.0 must upgrade before 26 October 2026, 17:42:48 UTC; for Hoodi nodes on versions earlier than 3.8.0, upgrading is recommended but not urgent.
- medium (all networks): This release is recommended for all users.
- Security: - Peer-traffic resilience. Caplin enforces consensus-spec size limits on gossip and peer responses. Historical block access list requests use a separate servin…
- Breaking changes: - Beacon API node identity metadata. /eth/v1/node/identity now returns seq_number instead of seq, 0x-prefixed attnets and syncnets, and custody_group_count fro…
Oct 23, 2026
Caplin (Erigon embedded CL)v3.8.0
Why this rating
- high (hoodi): Upgrade Hoodi nodes before 26 October 2026, 17:42:48 UTC.
- Security: - Network decoders allocate buffers as data arrives and reject impossible compressed sizes. Tighter bounds on peer queues, transaction packets, and Caplin goss…
- consensus-safety wording: "- Execution fixes stale commitment reads after reorgs and recovery from invalid blocks."
- Breaking changes: - Batched database syncing is now the default. This reduces disk-flush pauses. A power loss can roll back recent unflushed commits; set --db.safe.nosync=false …
- fork readiness: "Erigon 3.8.0 is Glamsterdam-ready, with Glamsterdam on Hoodi, faster commitment and execution, and further RPC performance improvements."
Oct 20, 2026
Caplin (Erigon embedded CL)v3.7.1
Why this rating
- high (sepolia): Upgrade Sepolia nodes before 6 October 2026, 13:53:36 UTC (epoch 353024).
- medium (all networks): This bugfix release is recommended for all users; no re-sync is required from 3.7.0.
- consensus-safety wording: "This avoids missed proposals during background flush and commit."
- Breaking changes: - cl/beacon: prefix custom graffiti with EL+CL client identification by default (#24394) by @lystopad — leaves 19 bytes for custom text, or 25 while the EL ver…
- fork readiness: "v3.7.1 makes Caplin ready for Glamsterdam on Sepolia."
Oct 2, 2026
Caplin (Erigon embedded CL)v3.7.0
Why this rating
- high (sepolia): Upgrade Sepolia nodes before 6 October 2026, 13:53:36 UTC.
- Breaking changes: - Receipt storage defaults change for fresh datadirs. To retain the previous disk-saving default, set --prune.include-receipts=false when creating the datadir.…
- performance wording: "Erigon 3.7.0 is headlined by parallel commitment enabled by default, broad RPC performance improvements, persisted receipts by default, and Glamsterdam on Sepolia."
Sep 25, 2026
Caplin (Erigon embedded CL)v3.6.1
Why this rating
- medium (all networks): v3.6.1 is a bugfix and security release recommended for all users.
- security wording: "v3.6.1 is a bugfix and security release recommended for all users."
- Security: - p2p/discover: require a proven bond before accepting a PING endpoint statement (#23639) by @yperbasis — an unbonded PING could feed an arbitrary claimed addr…
Sep 9, 2026
Caplin (Erigon embedded CL)v3.6.0
Why this rating
- Breaking changes: - Downgrading after 3.6 writes new snapshot files is unsupported. New 3.6 snapshot and accessor formats are incompatible with Erigon 3.5. Back up the datadir b…
- performance wording: "- Faster state access and snapshot maintenance."
Aug 24, 2026
Caplin (Erigon embedded CL)v3.5.5
Why this rating
- medium (all networks): v3.5.5 is a bugfix and security release recommended for all users, and especially for block proposers and archive-node operators.
- security wording: "v3.5.5 is a bugfix and security release recommended for all users, and especially for block proposers and archive-node operators."
Aug 12, 2026
Caplin (Erigon embedded CL)v3.5.4
Why this rating
- medium (all networks): v3.5.4 is a bugfix release recommended for all users, and especially for operators running the RPC daemon with response compression enabled — archive nodes and high-traffic RPC endpoints — where a na…
- performance wording: "v3.5.4 is a bugfix release recommended for all users, and especially for operators running the RPC daemon with response compression enabled — archive nodes and high-traffic RPC en…"
Jul 29, 2026
Caplin (Erigon embedded CL)v3.5.3
Why this rating
- medium (all networks): v3.5.3 is a bugfix release recommended for all users.
Jul 23, 2026
Caplin (Erigon embedded CL)v3.5.2
Why this rating
- medium (all networks): v3.5.2 is a bugfix release recommended for all users, and especially for anyone running 3.5.1 — it fixes a sync-halting trie-root regression introduced there (#22399).
Jul 13, 2026
Caplin (Erigon embedded CL)v3.5.1
Why this rating
- medium (all networks): v3.5.1 is a bugfix release recommended for all users.
Jul 10, 2026
Caplin (Erigon embedded CL)v3.5.0
Why this rating
- Security: - --ethstats credentials are redacted from the startup command log (#20890) — by @MysticRyuujin - DoS-resistance limits on inbound P2P message volume (#20577, …
- breaking wording: "It is a drop-in upgrade for 3.4.x users — no re-sync required; existing datadirs upgrade their prune configuration automatically (see Breaking Changes)."
- performance wording: "Erigon now executes EVM transactions across multiple cores by default, using the Block-STM (software transactional memory) design pioneered by Aptos: transactions run optimistical…"
Jun 26, 2026
Caplin (Erigon embedded CL)v3.4.4
Why this rating
- medium (all networks): v3.4.4 is a bugfix release recommended for all users.
Jun 18, 2026
Caplin (Erigon embedded CL)v3.4.3
Why this rating
- medium (all networks): v3.4.3 is a bugfix release recommended for all users.
Jun 2, 2026
Caplin (Erigon embedded CL)v3.4.2
Why this rating
- medium (all networks): v3.4.2 is a bugfix release recommended for all users.
May 22, 2026
Caplin (Erigon embedded CL)v3.4.1
May 11, 2026
Caplin (Erigon embedded CL)v3.4.0
Why this rating
- security wording: "- github.com/buger/jsonparser: bump 1.1.1 → 1.1.2 to address CVE-2026-32285 (HIGH, CVSS 7.5 — out-of-bounds read)."
- Security: - github.com/buger/jsonparser: bump 1.1.1 → 1.1.2 to address CVE-2026-32285 (HIGH, CVSS 7.5 — out-of-bounds read). (#20018) ---
- Breaking changes: - Minimum Go version: 1.25 - --rpc.blockrange.limit=1_000 new limit. Maximum block range (end - begin) allowed for range queries over RPC. 0 - means unlimited.…
- performance wording: "The Erigon team is happy to announce the release of Erigon 3.4.0 "Splashing Saga" — a major update for node operators and validators, focused on stability, performance, and effici…"
Apr 28, 2026
Caplin (Erigon embedded CL)v3.4.0-rc.5
Why this rating
- Breaking changes: - Minimum Go version: 1.25 - --rpc.blockrange.limit=1_000 new limit. Maximum block range (end - begin) allowed for range queries over RPC. 0 - means unlimited.…
- performance wording: "- Reduced impact on ChainTip performance: from RPC, background file merging, pruning, and optional heavy flags (--persist.receipts, --prune.include-commitment-history)."
Apr 24, 2026
Caplin (Erigon embedded CL)v3.3.10
Why this rating
- high (mainnet): v3.3.10 - Rocky Romp This release schedules Fusaka on Gnosis Chain mainnet at Tue 14 April 2026, 12:06:20 UTC and thus is mandatory for all Gnosis users.
- fork scheduled (mainnet): v3.3.10 - Rocky Romp This release schedules Fusaka on Gnosis Chain mainnet at Tue 14 April 2026, 12:06:20 UTC and thus is mandatory for all Gnosis users.
- medium (all networks): It is also recommended for all users in general.
Mar 27, 2026
Caplin (Erigon embedded CL)v3.3.9
Mar 9, 2026
Caplin (Erigon embedded CL)v3.3.8
Feb 20, 2026
Caplin (Erigon embedded CL)v3.3.7
Why this rating
- performance wording: "Prune performance."
Jan 30, 2026
Caplin (Erigon embedded CL)v3.3.4
Why this rating
- medium (all networks): v3.3.4 - Rocky Romp v3.3.4 is a bugfix release recommended for all users.
Jan 23, 2026
Caplin (Erigon embedded CL)v3.3.3
Why this rating
- medium (all networks): v3.3.3 - Rocky Romp v3.3.3 is a bugfix release recommended for all users.
- security wording: "- p2p: resolve security vulnerability in #18650 by @yperbasis"
Jan 14, 2026
Caplin (Erigon embedded CL)v3.3.2
Dec 13, 2025
Caplin (Erigon embedded CL)v3.2.4
Dec 9, 2025
Caplin (Erigon embedded CL)v3.3.1
Dec 7, 2025
Caplin (Erigon embedded CL)v3.3.0
Why this rating
- performance wording: "- SkipAnalysis VM optimization removed (#17217)"
Nov 27, 2025
Caplin (Erigon embedded CL)v3.2.3
Nov 25, 2025
Caplin (Erigon embedded CL)v3.2.2
Why this rating
- high (mainnet): Thus it is a mandatory update for all Ethereum mainnet users.
- fork scheduled (mainnet): v3.2.2 "Quirky Quests" v3.2.2 schedules Fusaka on Ethereum mainnet on December 3, 2025 at 09:49:11pm UTC.
Nov 3, 2025
Caplin (Erigon embedded CL)v3.2.1
Why this rating
- medium (all networks): v3.2.1 "Quirky Quests" v3.2.1 is a bugfix release recommended for all users, especially validators.
Oct 20, 2025
Caplin (Erigon embedded CL)v3.2.0
Why this rating
- performance wording: "- EVM: MODEXP precompile performance improvements (#16579, #16583, #16396, #17151) by @chfast & @yperbasis"
Oct 2, 2025