Version 1.50.3 (2026-06-15)

What's Changed

🎉 New Features / Improvements

• feat: support Fetch v12 by @dnwe in #3609
• feat: support CreateTopics v6 by @dnwe in #3622
• feat: support DeleteTopics v5 by @dnwe in #3624
• feat: support AddPartitionsToTxn v3 by @hindessm in #3625
• feat: support Produce v9 by @dnwe in #3629
• feat: support CreatePartitions v3 by @dnwe in #3631
• feat: expose broker features from ApiVersions v3 by @dnwe in #3633
• feat: support UpdateFeatures by @dnwe in #3632
• feat: add OnAssignmentBalanceStrategy, the onAssignment half of the assignor contract by @lizthegrey in #3627
• feat: support ApiVersions V4 and discover upgradable features in test by @dnwe in #3634

🐛 Fixes

• fix: avoid makeslice "len out of range" panics on invalid response by @hindessm in #3612
• fix: avoid makeslice panic in request decode too by @dnwe in #3613
• fix(test): wait for leaders after topic create by @dnwe in #3623
• fix(consumer): don't panic on requeue after unref by @dnwe in #3630

📦 Dependency updates

• chore(deps): update golang-x to v0.53.0 by @renovate[bot] in #3618
• fix(deps): update module golang.org/x/sys to v0.46.0 - autoclosed by @renovate[bot] in #3617
• fix(deps): update module golang.org/x/sync to v0.21.0 by @renovate[bot] in #3616
• fix(deps): update module golang.org/x/net to v0.56.0 by @renovate[bot] in #3626

🔧 Maintenance

• chore: update default Kafka version to 2.6 by @dnwe in #3608
• chore: more protocol version placeholders by @hindessm in #3610
• chore: extend fuzz testing to more types by @dnwe in #3614
• chore: clean up Int32 array encode/decode by @hindessm in #3619
• chore: apply Go's modernize fixes by @dnwe in #3621

Full Changelog: v1.50.2...v1.50.3