diff --git a/CHANGELOG.md b/CHANGELOG.md
index d20e0c9..5c37582 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.3.4] - 2026-09-26
+
+### Fixed
+- Retry workflow-task heartbeat after a compatible Server reports temporary
+  database loss with an unknown outcome. The worker checks the exact task,
+  lease owner, and attempt before resending the same request, including on
+  path-prefixed managed runtime URLs. Server 2.4.11 adds this response; older
+  Servers retain their existing behavior.
+
 ## [2.3.3] - 2026-09-26
 
 ### Fixed
diff --git a/pyproject.toml b/pyproject.toml
index fea3f45..0468431 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "durable-workflow"
-version = "2.3.3"
+version = "2.3.4"
 description = "Python client and worker SDK for Durable Workflow Cloud and self-hosted Server"
 readme = "README.md"
 requires-python = ">=3.10"
@@ -71,8 +71,8 @@ durable-workflow-replay-conformance = "durable_workflow.replay_conformance:main"
 durable-workflow-workflow-updates-conformance = "durable_workflow.workflow_updates_conformance:main"
 
 [tool.durable-workflow]
-product-train = "2.3.3"
-registry-version = "2.3.3"
+product-train = "2.3.4"
+registry-version = "2.3.4"
 supported-server-versions = "2.4.8"
 worker-protocol-version = "1.19"
 control-plane-version = "2"