diff --git a/CHANGELOG.md b/CHANGELOG.md
index c79ad85b..0a0cb6d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,27 @@
 # Changelog
 
+## [1.1.20](https://github.com/trpc-group/trpc-agent-python/releases/tag/v1.1.20) (2026-09-01)
+
+### Features
+
+* A2A: Added A2A 1.0 support through the new `a2a-v1` optional extra and `trpc_agent_sdk.server.a2a_v1` package, including agent services, remote agents, Agent Card discovery, artifact-first streaming, task cancellation, and compatibility bridging for legacy A2A 0.3 peers. Existing A2A 0.3 integrations remain supported without code changes.
+* Memory: Added the optional Advanced Memory subsystem for file-backed long-term and session memory, including `AdvancedMemoryService`, `AdvancedMemorySessionService`, transcript persistence, structured session-memory extraction, memory freshness metadata, and `save_memory`, `read_memory`, and `list_memory_index` tools.
+* Memory: Added a staged context-management pipeline with bounded long-term-memory injection, oversized tool-result spill and preview, history trimming, micro-compaction, LLM-driven auto-compaction, token-aware context budgets, relevant-memory preloading, and cross-event-loop session coordination.
+* Runner: Added automatic binding and session-service wrapping when Advanced Memory services are supplied, allowing the Advanced Memory context pipeline to integrate through the existing `session_service` and `memory_service` interfaces.
+
+### Bug Fixes
+
+* Model: Fixed OpenAI 3.x with httpx 2.x raising stream-close errors after the SSE `[DONE]` marker in Chat Completions and Responses API streaming.
+
+### Docs
+
+* A2A: Added English and Chinese A2A 1.0 documentation and runnable examples for basic agents, multi-turn tool use, remote cancellation, and agent transfer.
+* Memory: Added an Advanced Memory example and comprehensive coverage for storage, transcripts, extraction, context budgeting, compaction, preload, and coordination behavior.
+
+### Internal
+
+* Memory: Reorganized Advanced Memory implementation modules behind a smaller public API and strengthened configuration validation while preserving lazy exports from the memory, session, and tools packages.
+
 ## [1.1.19](https://github.com/trpc-group/trpc-agent-python/releases/tag/v1.1.19) (2026-08-21)
 
 Version bump to keep the `main` and `r0.1` branches in sync; carries forward the fixes already included in 1.1.18 (LLM streaming interruption span fixes and CI extension package installation).
diff --git a/tests/test_version.py b/tests/test_version.py
index 913c7be5..4dfe30ac 100644
--- a/tests/test_version.py
+++ b/tests/test_version.py
@@ -10,4 +10,4 @@
 
 def test_version():
     """Test the version module."""
-    assert __version__ == '1.1.19'
+    assert __version__ == '1.1.20'
diff --git a/trpc_agent_sdk/version.py b/trpc_agent_sdk/version.py
index 3d50d525..0d488c1c 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__ = '1.1.19'
+__version__ = '1.1.20'