Release Notes
- Quicklinks
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Release 3.3 | Release 3.2 | Release 3.1 | Release 3.0 | Archived documentation
Couchbase Sync Gateway
This content describes the key features and changes implemented by release 4.0 of Couchbase Sync Gateway
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One Way Upgrade
The migration to a 4.x configuration is a ONE WAY process — see: Upgrading for more. |
4.0.7 — July 2026
| If you use Sync Gateway 4.0.5 or 4.0.6, upgrade to this release to receive critical fixes. |
Fixed Issues
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CBG-5368 — Problem with channel removal macro expansion when channel names have
.in them -
CBG-5383 — Resync regenerate sequences will not set _default metadata id when finished
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CBG-5453 — Subdoc operation failure on multiple channel removal
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CBG-5553 — activeOnly replication can miss documents for channels over the pagination limit
4.0.3 — February 2026
Fixed Issues
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CBG-4949 — Duplicate conflict logging during legacy rev processing
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CBG-4998 — Import feed panics for docs with CV in _sync.rev.ver but no
_vv xattr -
CBG-5016 — Panic in _config?include_runtime=true endpoint when database has failed to start
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CBG-5042 — Couchbase Server timeout error causes panic in GetUser
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CBG-5055 — Non-integer sequence numbers are incorrectly encoded for
norevmessages for CBL -
CBG-5107 — Channel information unavailable for non-current revisions
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CBG-5132 — Clients fetching a delta can panic when the revision cache is disabled
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CBG-5135 — Current revision attachments can be loaded when loading backup rev by CV
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CBG-5146 — replacement revs never utilized for unfiltered replications
4.0.2 — December 2025
4.0.0 — October 2025
Enhancements
Upgrading
For more on upgrading — see: Upgrading