diff --git a/README.md b/README.md
index 8e1202c..cb751ba 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,7 @@
 
 ## 📢 News
 
+- **2026-02-21** 🎉 Released **v0.1.4.post1** — new providers, media support across channels, and major stability improvements. See [release notes](https://github.com/HKUDS/nanobot/releases/tag/v0.1.4.post1) for details.
 - **2026-02-20** 🐦 Feishu now receives multimodal files from users. More reliable memory under the hood.
 - **2026-02-19** ✨ Slack now sends files, Discord splits long messages, and subagents work in CLI mode.
 - **2026-02-18** ⚡️ nanobot now supports VolcEngine, MCP custom auth headers, and Anthropic prompt caching.
@@ -33,6 +34,7 @@
 
 <details>
 <summary>Earlier news</summary>
+
 - **2026-02-10** 🎉 Released **v0.1.3.post6** with improvements! Check the updates [notes](https://github.com/HKUDS/nanobot/releases/tag/v0.1.3.post6) and our [roadmap](https://github.com/HKUDS/nanobot/discussions/431).
 - **2026-02-09** 💬 Added Slack, Email, and QQ support — nanobot now supports multiple chat platforms!
 - **2026-02-08** 🔧 Refactored Providers—adding a new LLM provider now takes just 2 simple steps! Check [here](#providers).
@@ -42,6 +44,7 @@
 - **2026-02-04** 🚀 Released **v0.1.3.post4** with multi-provider & Docker support! Check [here](https://github.com/HKUDS/nanobot/releases/tag/v0.1.3.post4) for details.
 - **2026-02-03** ⚡ Integrated vLLM for local LLM support and improved natural language task scheduling!
 - **2026-02-02** 🎉 nanobot officially launched! Welcome to try 🐈 nanobot!
+
 </details>
 
 ## Key Features of nanobot:
diff --git a/nanobot/agent/context.py b/nanobot/agent/context.py
index 5794918..c5869f3 100644
--- a/nanobot/agent/context.py
+++ b/nanobot/agent/context.py
@@ -231,7 +231,7 @@ To recall past events, grep {workspace_path}/memory/HISTORY.md"""
             msg["tool_calls"] = tool_calls
 
         # Include reasoning content when provided (required by some thinking models)
-        if reasoning_content:
+        if reasoning_content is not None:
             msg["reasoning_content"] = reasoning_content
 
         messages.append(msg)
diff --git a/nanobot/providers/registry.py b/nanobot/providers/registry.py
index ecf092f..2766929 100644
--- a/nanobot/providers/registry.py
+++ b/nanobot/providers/registry.py
@@ -147,7 +147,7 @@ PROVIDERS: tuple[ProviderSpec, ...] = (
         keywords=("volcengine", "volces", "ark"),
         env_key="OPENAI_API_KEY",
         display_name="VolcEngine",
-        litellm_prefix="openai",
+        litellm_prefix="volcengine",
         skip_prefixes=(),
         env_extras=(),
         is_gateway=True,
diff --git a/pyproject.toml b/pyproject.toml
index 64a884d..c337d02 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "nanobot-ai"
-version = "0.1.4"
+version = "0.1.4.post1"
 description = "A lightweight personal AI assistant framework"
 requires-python = ">=3.11"
 license = {text = "MIT"}