Bump Akka.TestKit.Xunit2 from 1.5.65 to 1.5.67

[dependabot]

Updated Akka.TestKit.Xunit2 from 1.5.65 to 1.5.67.

Release notes

Sourced from Akka.TestKit.Xunit2's releases.

1.5.67

1.5.67 April 25th, 2026

Akka.NET v1.5.67 is a hotfix release that reverts a breaking change to the persistence plugin contract introduced in v1.5.66.

Akka.Persistence: Revert async WriteMessagesAsync/SaveAsync dispatch (#​8163)

v1.5.66 added Task.Yield() inside AsyncWriteJournal.ExecuteBatch and SnapshotStore to move persistence plugin WriteMessagesAsync/SaveAsync calls off the actor thread. While this improved throughput in benchmarks, it silently broke the implicit contract that persistence plugins rely on — that the synchronous preamble of these methods executes in actor context.

This caused failures in plugins that:

• Access Self inside WriteMessagesAsync (e.g. Akka.Persistence.Sql, Akka.Persistence.EventStore) — throws NotSupportedException off the actor thread
• Use non-thread-safe collections for write tracking (e.g. Dictionary<string, Task>) — concurrent access from actor thread and thread pool causes InvalidOperationException
• Send messages to subscribers after writes complete (e.g. Akka.Persistence.Redis) — accesses shared actor state off-thread

This release removes the Task.Yield() calls and restores the original dispatch behavior. A future version may reintroduce this optimization with a more targeted approach that preserves the plugin threading contract.

If you are on v1.5.66, upgrade to v1.5.67 immediately if you use any third-party persistence plugin.

COMMITS	LOC+	LOC-	AUTHOR
1	3	17	Aaron Stannard

Changes:

• 2f057e49852313996cc196000a917b1cbaf67588 Update RELEASE_NOTES.md for 1.5.67 release
• 46371dd4c04fc8bdd2a9eba574a5ed79e1b083b2 revert(persistence): remove Task.Yield() from AsyncWriteJournal and SnapshotStore (#​8163)

This list of changes was auto generated.

1.5.66

1.5.66 April 24th, 2026

Akka.NET v1.5.66 is a significant release with persistence bug fixes, major Akka.Streams improvements including OpenTelemetry trace propagation and non-blocking materialized values, and new serialization security controls.

Akka.Streams: OpenTelemetry Trace Context Propagation

Akka.Streams now propagates System.Diagnostics.Activity trace context end-to-end through stream graphs, including across async stage boundaries, fan-in merges, and fan-out broadcasts. This enables full distributed tracing visibility into stream pipelines when using OpenTelemetry.

For full documentation, see: https://getakka.net/articles/streams/stream-tracing.html

• Akka.Streams: end-to-end OpenTelemetry trace context propagation

Akka.Streams: Non-Blocking Materialized-Value TaskCompletionSource

All TaskCompletionSource instances used for materialized values across Akka.Streams now use TaskCreationOptions.RunContinuationsAsynchronously, eliminating potential deadlocks and thread-pool starvation when continuations run synchronously on completion.

• Non-blocking materialized-value TaskCompletionSource

Akka.Persistence

• Redesign MemoryJournal and MemorySnapshotStore with channel-based drain-on-read pattern
• Ensure WriteMessagesAsync/SaveAsync is called asynchronously

Akka.Core

• Filter link-local (APIPA) addresses from DNS resolution results
• Fix multi-node adapter output race

New Features

• Add allow-unregistered-types serialization setting — when set to false, FindSerializerForType throws SerializationException if no explicit serializer binding exists, rather than falling back to the default serializer.
• Widen ActorTaskScheduler(ActorCell) ctor to protected internal

Documentation

• Surface serialization security guidance on remoting security page
• Replace TBD XML doc placeholders in Scheduler and Stash

4 contributors since release 1.5.65

COMMITS	LOC+	LOC-	AUTHOR
18	3962	991	Aaron Stannard
8	1627	1952	Gregorius Soedharmo
6	214	177	Matt Kotsenas
1	55	39	schdooz

To see the full set of changes in Akka.NET v1.5.66, click here.

Changes:

• ed4bd3b22a8e936c3dc61645911a43d6a56ea651 fix(api-approval): update Net.verified.txt files to match v1.5.66 API surface [ #​8158, #​8184, #​8160 ]
• db7d0c61403b21023ee4b1f97abe37bfabbf6090 Update RELEASE_NOTES.md for 1.5.66 release
  ... (truncated)

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