diff --git a/CHANGELOG.md b/CHANGELOG.md
index 60f7789c..bf07dbab 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,9 +2,18 @@
## Unreleased
+## v1.27.0
+
- Add `Microsoft.DurableTask.LargePayloadPurge.Abstractions` with shared fetch/report and service-setting interfaces, and expose the existing blob purge tasks for host integration ([#805](https://github.com/microsoft/durabletask-dotnet/pull/805)).
-- Preserve the original orchestration version when restarting through the orchestration-service client shim ([#463](https://github.com/microsoft/durabletask-dotnet/issues/463)).
+- Isolate in-process test-host work-item completion by delivery token ([#815](https://github.com/microsoft/durabletask-dotnet/pull/815)).
+- Await backend operations for in-process test-host task-hub lifecycle changes ([#813](https://github.com/microsoft/durabletask-dotnet/pull/813)).
+- Release streamed history snapshots after in-process test-host work items complete ([#811](https://github.com/microsoft/durabletask-dotnet/pull/811)).
+- Treat omitted purge start times as unbounded in the in-process test host ([#810](https://github.com/microsoft/durabletask-dotnet/pull/810)).
+- Fix orchestration history retrieval in the in-process test host ([#809](https://github.com/microsoft/durabletask-dotnet/pull/809)).
+- Preserve the original orchestration version when restarting through the orchestration-service client shim ([#808](https://github.com/microsoft/durabletask-dotnet/pull/808), [#463](https://github.com/microsoft/durabletask-dotnet/issues/463)).
- Support configurable scheduler token audiences and government defaults ([#806](https://github.com/microsoft/durabletask-dotnet/pull/806))
+- Add opt-in large-payload blob auto-purge with a persistent orchestration and shared Client purge models ([#758](https://github.com/microsoft/durabletask-dotnet/pull/758)).
+- Update `Microsoft.Azure.DurableTask.Core` from `3.9.0` to the published `3.11.1` release.
## v1.26.0
- Adding rewind to the sidecar by sophiatev ([#802](https://github.com/microsoft/durabletask-dotnet/pull/802))
diff --git a/Directory.Packages.props b/Directory.Packages.props
index 7b634b8f..b45a4435 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -39,7 +39,7 @@
-
+
diff --git a/eng/targets/Release.props b/eng/targets/Release.props
index 6c5d6ae4..9912064e 100644
--- a/eng/targets/Release.props
+++ b/eng/targets/Release.props
@@ -18,7 +18,7 @@
- 1.26.0
+ 1.27.0
diff --git a/src/Abstractions/RELEASENOTES.md b/src/Abstractions/RELEASENOTES.md
index a8a7452d..6a0308c3 100644
--- a/src/Abstractions/RELEASENOTES.md
+++ b/src/Abstractions/RELEASENOTES.md
@@ -1 +1 @@
-- Microsoft.Azure.DurableTask.Core dependency increased to `3.0.0`
\ No newline at end of file
+- Update the `Microsoft.Azure.DurableTask.Core` dependency to `3.11.1`.
\ No newline at end of file
diff --git a/src/Client/AzureManaged.Sandboxes/RELEASENOTES.md b/src/Client/AzureManaged.Sandboxes/RELEASENOTES.md
new file mode 100644
index 00000000..862109a5
--- /dev/null
+++ b/src/Client/AzureManaged.Sandboxes/RELEASENOTES.md
@@ -0,0 +1 @@
+- Honor configured scheduler token audiences and per-instance government/DoD defaults when connecting to sandbox activities.
diff --git a/src/Client/AzureManaged/RELEASENOTES.md b/src/Client/AzureManaged/RELEASENOTES.md
index 6766f7b1..0c806582 100644
--- a/src/Client/AzureManaged/RELEASENOTES.md
+++ b/src/Client/AzureManaged/RELEASENOTES.md
@@ -1,3 +1,2 @@
- Support normalized ResourceId token audiences in options and connection strings, with per-instance government/DoD defaults that select the audience registered in that cloud. Public-cloud defaults are unchanged; cross-cloud scheduler access is unsupported.
-- Support independent AuthorityHost connection-string configuration for SDK-created credentials that accept an authority, preserving Azure Identity defaults when omitted.
-- Released first version Microsoft.DurableTask.Client.AzureManaged - 1.5.0-preview.1
\ No newline at end of file
+- Support independent AuthorityHost connection-string configuration for SDK-created credentials that accept an authority, preserving Azure Identity defaults when omitted.
\ No newline at end of file
diff --git a/src/Client/Core/RELEASENOTES.md b/src/Client/Core/RELEASENOTES.md
index dfa5b970..a9e1f098 100644
--- a/src/Client/Core/RELEASENOTES.md
+++ b/src/Client/Core/RELEASENOTES.md
@@ -1 +1,2 @@
-- Add new `IDurableTaskClientBuilder AddDurableTaskClient(IServiceCollection, string?)` API
+- Add `LargePayloadTombstone`, `LargePayloadPurgeResult`, and `LargePayloadPurgeDisposition` models for large-payload blob cleanup.
+- Update the transitive `Microsoft.Azure.DurableTask.Core` dependency to `3.11.1`.
diff --git a/src/Client/Grpc/RELEASENOTES.md b/src/Client/Grpc/RELEASENOTES.md
index e69de29b..f80187ba 100644
--- a/src/Client/Grpc/RELEASENOTES.md
+++ b/src/Client/Grpc/RELEASENOTES.md
@@ -0,0 +1 @@
+- Support large-payload auto-purge control over the existing authenticated gRPC client transport.
\ No newline at end of file
diff --git a/src/Client/OrchestrationServiceClientShim/RELEASENOTES.md b/src/Client/OrchestrationServiceClientShim/RELEASENOTES.md
new file mode 100644
index 00000000..850f6103
--- /dev/null
+++ b/src/Client/OrchestrationServiceClientShim/RELEASENOTES.md
@@ -0,0 +1 @@
+- Preserve the original orchestration version when restarting an instance, with either its existing instance ID or a new one.
diff --git a/src/Extensions/AzureBlobPayloads/RELEASENOTES.md b/src/Extensions/AzureBlobPayloads/RELEASENOTES.md
new file mode 100644
index 00000000..765c51f2
--- /dev/null
+++ b/src/Extensions/AzureBlobPayloads/RELEASENOTES.md
@@ -0,0 +1,4 @@
+- Add opt-in large-payload blob auto-purge with a persistent orchestration, controlled through `SetLargePayloadAutoPurgeAsync`.
+- Reclaim self-describing `blob:v2` payloads; legacy `blob:v1` payloads are not deleted.
+- Expose the shared purge orchestrator and activities for alternate-host integration through `Microsoft.DurableTask.LargePayloadPurge.Abstractions`.
+- Keep purge transport attached to each named worker's authenticated channel across reconnections, and include infrastructure tasks in work-item filters without applying customer task-version policies to them.
diff --git a/src/Grpc/RELEASENOTES.md b/src/Grpc/RELEASENOTES.md
index e69de29b..383e8526 100644
--- a/src/Grpc/RELEASENOTES.md
+++ b/src/Grpc/RELEASENOTES.md
@@ -0,0 +1 @@
+- Add large-payload purge service messages for enabling cleanup, fetching tombstones, and reporting deletion results.
\ No newline at end of file
diff --git a/src/InProcessTestHost/RELEASENOTES.md b/src/InProcessTestHost/RELEASENOTES.md
new file mode 100644
index 00000000..d57dcda5
--- /dev/null
+++ b/src/InProcessTestHost/RELEASENOTES.md
@@ -0,0 +1,6 @@
+- Return ordered, committed history snapshots for the current orchestration execution, including terminal events.
+- Treat omitted creation-time purge bounds as unbounded and evaluate explicit inclusive bounds in UTC.
+- Release temporary worker history snapshots after work-item completion or dispatch failure.
+- Await backend operations when creating, starting, stopping, or deleting a task hub.
+- Isolate activity and orchestration completion by per-delivery completion tokens. Direct gRPC callers must echo the received `completionToken`; partial or chunked orchestration completion is unsupported and fails the orchestration.
+- Update the `Microsoft.Azure.DurableTask.Core` dependency to `3.11.1`.
diff --git a/src/LargePayloadPurge.Abstractions/RELEASENOTES.md b/src/LargePayloadPurge.Abstractions/RELEASENOTES.md
index 51224bf7..73665b7f 100644
--- a/src/LargePayloadPurge.Abstractions/RELEASENOTES.md
+++ b/src/LargePayloadPurge.Abstractions/RELEASENOTES.md
@@ -1 +1 @@
-- Initial service and activity transport contracts for large payload auto-purge, using the canonical Durable Task SDK Client models.
+- Add `ILargePayloadPurgeClient` fetch/report and `IOrchestrationServiceLargePayloadPurgeClient` service-setting contracts for large-payload auto-purge, using the canonical Durable Task SDK Client models.
diff --git a/src/Worker/AzureManaged.Sandboxes/RELEASENOTES.md b/src/Worker/AzureManaged.Sandboxes/RELEASENOTES.md
new file mode 100644
index 00000000..bd8d8470
--- /dev/null
+++ b/src/Worker/AzureManaged.Sandboxes/RELEASENOTES.md
@@ -0,0 +1 @@
+- Preserve configured scheduler token audiences and per-instance government/DoD defaults when registering and reconnecting sandbox workers.
diff --git a/src/Worker/AzureManaged/RELEASENOTES.md b/src/Worker/AzureManaged/RELEASENOTES.md
index ae020fe7..ef8783b3 100644
--- a/src/Worker/AzureManaged/RELEASENOTES.md
+++ b/src/Worker/AzureManaged/RELEASENOTES.md
@@ -1,3 +1,2 @@
- Support normalized ResourceId token audiences in options and connection strings, with per-instance government/DoD defaults retained for worker and sandbox registration reconnects. These defaults select the audience registered in that cloud. Public-cloud defaults are unchanged; cross-cloud scheduler access is unsupported.
-- Support independent AuthorityHost connection-string configuration for SDK-created credentials that accept an authority, preserving Azure Identity defaults when omitted.
-- Released first version Microsoft.DurableTask.Worker.AzureManaged - 1.5.0-preview.1
\ No newline at end of file
+- Support independent AuthorityHost connection-string configuration for SDK-created credentials that accept an authority, preserving Azure Identity defaults when omitted.
\ No newline at end of file
diff --git a/src/Worker/Core/RELEASENOTES.md b/src/Worker/Core/RELEASENOTES.md
index c00e885b..55ee6c0f 100644
--- a/src/Worker/Core/RELEASENOTES.md
+++ b/src/Worker/Core/RELEASENOTES.md
@@ -1 +1 @@
-- Add new `IDurableTaskWorkerBuilder AddDurableTaskWorker(IServiceCollection, string?)` API
+- Update the transitive `Microsoft.Azure.DurableTask.Core` dependency to `3.11.1`.
diff --git a/src/Worker/Grpc/RELEASENOTES.md b/src/Worker/Grpc/RELEASENOTES.md
index e69de29b..02aa9c4f 100644
--- a/src/Worker/Grpc/RELEASENOTES.md
+++ b/src/Worker/Grpc/RELEASENOTES.md
@@ -0,0 +1,3 @@
+- Add configurable gRPC interceptors that remain attached when the worker recreates its channel.
+- Keep infrastructure auto-purge tasks independent of customer task-version policies while preserving customer task filters and version checks.
+- Update the `Microsoft.Azure.DurableTask.Core` dependency to `3.11.1`.
\ No newline at end of file