akkadotnet/akka.net 1.5.61

Akka.NET v1.5.61

on GitHub

1.5.61 February 26th, 2026

Akka.NET v1.5.61 is a maintenance release with important bug fixes for Akka.Cluster.Sharding, Akka.Cluster, and Akka.Core.

Akka.Cluster.Sharding Bug Fixes

• Port Pekko ShardStopped handler + handoff safety net - Fixes issue #7500. Resolves a critical issue where shards could fail to hand off indefinitely during scale-up events.
• Fix Shard remember-entities flag mismatch causing entity restart failures - Fixes a bug where the Entities class was initialized with the wrong RememberEntities flag.
• Correct self-comparison in ShardCoordinator ResendShardHost handler - Fixes a bug where the ResendShardHost handler compared a region variable to itself instead of comparing against the message's region.

Akka.Cluster Bug Fixes

• VectorClock inequality fixes - Fixes the != operator which incorrectly delegated to IsConcurrentWith instead of being the logical negation of ==, and fixes the < operator to correctly exclude the equal case.
• Correct format index in 3-arg LogInfo overload - Fixes a logging bug where the 3-arg LogInfo overload used the wrong format index.

Bug Fixes

• Fix wrong randomFactor argument type on RetrySupport.Retry() - Fixes issue #8059. Changes the randomFactor parameter type from int to double to match the expected behavior for jitter calculations.
• AppVersion.CompareTo missing else if breaks comparison symmetry - Fixes a bug where release versions appeared less than their pre-release counterparts.
• Remove stray dollar signs from interpolated strings - Fixes three string interpolation bugs in output in ClusterHeartbeat, ShardRegion, and SinkRefImpl.

Improvements

• Downgrade VirtualPathContainer RemoveChild log from Warning to Debug - Fixes issue #8037. Eliminates noisy warnings during high-load Ask operations.

4 contributors since release 1.5.60

To see the full set of changes in Akka.NET v1.5.61, click here.

Changes:

• a5b74fd Update RELEASE_NOTES.md for 1.5.61 release (#8063)
• e5eda84 Update v1.5 branch with latest v1.6 changes (#8062) [ #8046, #8052, #8048, #8037, #8051, #8054, #8050, #7500, #8055, #8056, #8057, #8058, #8061 ]
• 6053083 Update API Approval list for .net 4.8
• be798e7 Fix wrong randomFactor argument type on RetrySupport.Retry() (#8061)
• 1acf5dc VectorClock inequality fixes (#8058)
• 8421776 fix: remove stray dollar signs from interpolated strings (#8057)
• 6fb236b fix: correct format index in 3-arg LogInfo overload (#8056)
• 53312a0 Port Pekko ShardStopped handler + handoff safety net (#7500) (#8055)
• 1b0f61a Correct self-comparison in ShardCoordinator ResendShardHost handler (#8050)
• c6c2080 Fix Shard remember-entities flag mismatch causing entity restart failures (#8054)