Releases: hirosystems/stacks-blockchain-api
v8.15.3
8.15.3 (2026-04-22)
Release Type:
DB Migration Required: ✅ No
Compatibility: ✅ Backwards compatible with v8.x.x
Release Summary
Version 8.15.3 is a patch upgrade that fixes a CRITICAL security vulnerability in one of the dependency packages.
What's Changed
Bug Fixes
Breaking Changes
None - This is a backwards-compatible release.
Upgrade Priority
| User Type | Priority | Recommended Timeline |
|---|---|---|
| Production API Operators | Medium | As soon as possible |
| Development Teams | Medium | As soon as possible |
| High-Traffic Applications | Medium | As soon as possible |
v8.15.2
8.15.2 (2026-04-14)
Release Type:
DB Migration Required: ✅ No
Compatibility: ✅ Backwards compatible with v8.x.x
Release Summary
Version 8.15.2 is a patch upgrade that optimizes the calculation of cache Etags for endpoints related to individual account activity.
What's Changed
Bug Fixes
Breaking Changes
None - This is a backwards-compatible release.
Upgrade Priority
| User Type | Priority | Recommended Timeline |
|---|---|---|
| Production API Operators | Medium | At your convenience |
| Development Teams | Medium | At your convenience |
| High-Traffic Applications | Medium | At your convenience |
v8.15.1
8.15.1 (2026-03-25)
Release Type:
DB Migration Required: ✅ No
Compatibility: ✅ Backwards compatible with v8.x.x
Release Summary
Version 8.15.1 is a patch upgrade that fixes a regression in the Stacks core /v2 request proxy that was causing node responses to be returned as raw response objects instead of actual JSONs. It's a necessary upgrade only if you're heavy users of this proxy.
What's Changed
Bug Fixes
Breaking Changes
None - This is a backwards-compatible release.
Upgrade Priority
| User Type | Priority | Recommended Timeline |
|---|---|---|
| Production API Operators | Medium | At your convenience |
| Development Teams | Medium | At your convenience |
| High-Traffic Applications | Medium | At your convenience |
v8.15.0
8.15.0 (2026-03-24)
Release Type: 🚨 REQUIRED
DB Migration Required: ✅ No
Compatibility: ✅ Backwards compatible with v8.x.x
Release Summary
Version 8.15.0 is a required release to support the upcoming Stacks 3.4 hard fork. Upgrade is mandatory, as not having this upgrade will cause the API to crash whenever a Clarity 5 transaction is processed.
This release also upgrades some dependencies to resolve security issues.
What's Changed
Features
Breaking Changes
None - This is a backwards-compatible release.
Upgrade Priority
| User Type | Priority | Recommended Timeline |
|---|---|---|
| Production API Operators | High | As soon as possible |
| Development Teams | High | As soon as possible |
| High-Traffic Applications | High | As soon as possible |
v8.14.2
8.14.2 (2026-03-10)
Release Type:
DB Migration Required: ✅ No
Compatibility: ✅ Backwards compatible with v8.x.x
Release Summary
Version 8.14.2 is a security release that updates dependencies to fix several security vulnerabilities.
What's Changed
Bug Fixes
- drop slow unused gin index on blocks (7c54120)
- force upgrade form-data transitive dependency (#2479) (3ceea38)
- upgrade snp client to 2.0.5 (#2473) (a927a9c)
Breaking Changes
None - This is a backwards-compatible release.
Upgrade Priority
| User Type | Priority | Recommended Timeline |
|---|---|---|
| Production API Operators | High | As soon as possible |
| Development Teams | High | As soon as possible |
| High-Traffic Applications | High | As soon as possible |
v8.14.1
8.14.1 (2026-02-25)
Release Type: ✅ RECOMMENDED
DB Migration Required: ✅ No
Compatibility: ✅ Backwards compatible with v8.x.x
Release Summary
Version 8.14.1 is a maintenance release that brings several block ingestion performance improvements and security patches, as well as a couple of optional features for modern Stacks event observers.
What's Changed
Features
- add option to stream blocks only with SNP (#2417) (34c20cd)
- enforce Redis stream max length for notifier queue (#2419) (17be15c)
- remove unused prod dependencies (#2427) (622ea37)
- upgrade to snp v2 (#2457) (b1dfc08)
Bug Fixes
- drop slow unused gin index on blocks (#2468) (a88cb8a)
- guard against non-string topic subscriptions (#2439) (f09553b), closes #2409 #2412
- optimize rbf query (94ffb09)
- remove OR from mempool queries (91cf73e)
- upgrade stacks codec for clarity 5 support (#2444) (c1494ac)
- wait at most 60 seconds for services to shutdown (#2448) (47c34cb)
Breaking Changes
None - This is a backwards-compatible release.
Upgrade Priority
| User Type | Priority | Recommended Timeline |
|---|---|---|
| Production API Operators | Low | At your convenience |
| Development Teams | Low | At your convenience |
| High-Traffic Applications | Low | At your convenience |
v8.13.6
8.13.6 (2025-12-22)
Release Type:
DB Migration Required: ✅ No
Compatibility: ✅ Backwards compatible with v8.x.x
Release Summary
Version 8.13.6 is a bug fix release that adds support for smart contracts that have empty source codes. Without this fix, attempting to look at these transactions via API endpoints resulted in an Unexpected nullish smart_contract_source_code error.
What's Changed
Bug Fixes
- Fixed: allow nullish smart contract source code in tx metadata (#2412) (e13c3b9)
- Impact: Adds empty smart contract source code support
Breaking Changes
None - This is a backwards-compatible release.
Upgrade Priority
| User Type | Priority | Recommended Timeline |
|---|---|---|
| Production API Operators | High | As soon as possible |
| Development Teams | High | As soon as possible |
| High-Traffic Applications | High | As soon as possible |
v8.13.5
8.13.5 (2025-12-02)
Release Type:
DB Migration Required: ✅ No
Compatibility: ✅ Backwards compatible with v8.x.x
Release Summary
Version 8.13.5 is a bug fix release that adds support for new SIP-034 tenure extend causes that will be available in the next Stacks core release. This is a required upgrade to avoid the API from stalling once these new extensions are live on mainnet and testnet.
What's Changed
Bug Fixes
- Fixed: support new sip-034 tenure change causes (#2384) (399908f)
- Impact: Supports SIP-034 tenure extend types
- Resolution: 399908f
Breaking Changes
None - This is a backwards-compatible release.
Upgrade Priority
| User Type | Priority | Recommended Timeline |
|---|---|---|
| Production API Operators | High | As soon as possible |
| Development Teams | High | As soon as possible |
| High-Traffic Applications | High | As soon as possible |
v8.13.4
8.13.4 (2025-11-06)
Release Type:
Migration Required: ❌ No
Compatibility: ✅ Backward compatible with v8.x.x
Release Summary
Version 8.13.4 is a bug fix release that adds support for Clarity 4 transactions, which will be a part of the upcoming Stacks 3.3 hard fork activation. This upgrade is mandatory for all Stacks API installations in order to avoid outage when Stacks 3.3 activates.
What's Changed
Bug Fixes
- Fixed: upgrade to latest stacks-encoding-native-js with arm64 support (#2376)
- Impact: Supports decoding Stacks transactions that use Clarity version 4
- Resolution: (5ab7328)
Infrastructure & Maintenance
- GLIBC System Dependency Change - This release requires version
2.33of GLIBC is installed on the machine where it's running. This only affects users running the Stacks Blockchain API binary in their own Docker image or directly on a machine. If using the Hiro Systems Docker imagedocker.io/hirosystems/stacks-blockchain-api:8.13.4, there should be no impact.
Breaking Changes
None - This is a backward-compatible release.
Upgrade Priority
| User Type | Priority | Recommended Timeline |
|---|---|---|
| Production API Operators | High | As soon as possible |
| Development Teams | High | As soon as possible |
| High-Traffic Applications | High | As soon as possible |
v8.13.2
8.13.2 (2025-10-21)
Release Type: ✅ RECOMMENDED
Migration Required: ✅ Automatic migration will be run
Compatibility: ✅ Backward compatible with v8.x.x
Release Summary
Version 8.13.2 is a bug fix release that adjusts the response data quality for two endpoints on the API related to Stacking pools and Bitcoin rewards. It also contains other unrelated stability fixes. A database migration will be run automatically by the API when upgrading but it is a quick data adjustment query that should take no more than 2 minutes to run.
What's Changed
Bug Fixes
- calculate burnchain reward reorgs correctly (#2355) (f82efbc)
- do not display revoked pool delegations (#2357) (c6de314)
- push redis updates to a stream (#2360) (2bfacf6)
- sanitize event observer strings (#2361) (2604539)
Breaking Changes
None - This is a backward-compatible release.
Upgrade Priority
| User Type | Priority | Recommended Timeline |
|---|---|---|
| Production API Operators | Low | At your convenience |
| Development Teams | Low | At your convenience |
| High-Traffic Applications | Low | At your convenience |