diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9d1c026..631edd6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,15 @@
 # Changelog
 
+## [1.1.9](https://github.com/trpc-group/trpc-agent-python/releases/tag/v1.1.9) (2026-06-18)
+
+### Features
+
+* Model: Added `http_client_factory` support to `OpenAIModel`, allowing callers to inject a custom `httpx.AsyncClient` factory to control HTTP connection lifecycle and pool settings such as keepalive expiry (#83).
+
+### Bug Fixes
+
+* Telemetry: Switched `agent_run` and `invocation` spans back to `start_as_current_span` so child spans such as `call_llm` inherit the correct parent context, restoring complete trace attributes (including system instructions and tools) in Langfuse reporting.
+
 ## [1.1.8](https://github.com/trpc-group/trpc-agent-python/releases/tag/v1.1.8) (2026-06-12)
 
 ### Features
diff --git a/tests/test_version.py b/tests/test_version.py
index 2b3f4e4..fce91ff 100644
--- a/tests/test_version.py
+++ b/tests/test_version.py
@@ -10,4 +10,4 @@
 
 def test_version():
     """Test the version module."""
-    assert __version__ == '1.1.8'
+    assert __version__ == '1.1.9'
diff --git a/trpc_agent_sdk/version.py b/trpc_agent_sdk/version.py
index eb7a64e..1ba449c 100644
--- a/trpc_agent_sdk/version.py
+++ b/trpc_agent_sdk/version.py
@@ -9,4 +9,4 @@
 This module defines the version information for TRPC Agent
 """
 
-__version__ = '1.1.8'
+__version__ = '1.1.9'