akkadotnet/akka.net 1.5.65

Akka.NET v1.5.65

on GitHub

1.5.65 April 10th, 2026

Akka.NET v1.5.65 is a maintenance release with important bug fixes for Akka.Cluster.Sharding, Akka.Core configuration, and Akka.TestKit.

Akka.Cluster.Sharding Bug Fixes

• Fix cluster sharding lease coordination bugs - Fixes three chained bugs that cause shard unavailability (~6 minutes) during rolling restarts when using distributed lease coordination (e.g. Kubernetes leases):
  • #8146: The backup ShardStopped safety net from #8055 fires spuriously after every successful rebalance, causing the same shard to be allocated to 2+ nodes simultaneously.
  • #8147: AwaitingLease stashes HandOff messages indefinitely, preventing the coordinator from reclaiming stuck shards.
  • #8148: StartShardRebalanceIfNeeded silently skips shards during graceful shutdown when a rebalance is already in progress.

Akka.Core Bug Fixes

• Fix Settings.InjectTopLevelFallback race condition bug - Fixes a race condition in Settings.InjectTopLevelFallback that could cause configuration corruption under concurrent access.

Akka.TestKit Bug Fixes

• Fix broken xUnit 3 explicit sender (IAsyncLifetime) - Fixes broken xUnit 3 explicit sender support when using IAsyncLifetime.

1 contributor since release 1.5.64

To see the full set of changes in Akka.NET v1.5.65, click here.

Changes:

• aa5ab20 Update RELEASE_NOTES.md for 1.5.65 release (#8157)
• c7a8cac Fix Settings.InjectTopLevelFallback race condition bug (#8143) (#8156)
• 51532ee Fix cluster sharding lease coordination bugs (#8150) [ #8146, #8147, #8148, #8055, #7500 ]
• e8309de [1.5] Port #8145 - Fix broken xUnit 3 explicit sender (IAsyncLifetime) (#8149)

This list of changes was auto generated.