diff --git a/README.md b/README.md
index 4c91f1cf..4978a30c 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ CowAgent is lightweight, easy to deploy, and built to extend. Plug in any major
 
 ## 🏗️ Architecture
 
-<img src="https://cdn.jsdelivr.net/gh/zhayujie/cowagent-assets@main/architecture/en/architecture.jpg" alt="CowAgent Architecture" width="750"/>
+<img src="https://cdn.jsdelivr.net/gh/zhayujie/cowagent-assets@main/architecture/en/architecture.png" alt="CowAgent Architecture" width="750"/>
 
 CowAgent is a complete **Agent Harness**: messages flow in through **Channels**; the **Agent Core** plans and reasons over memory, knowledge, and the available tools and skills; **Models** generate the response, which is sent back through the originating channel. Every layer is decoupled and independently extensible.
 
diff --git a/docs/intro/architecture.mdx b/docs/intro/architecture.mdx
index a9797bf1..77fdbc8a 100644
--- a/docs/intro/architecture.mdx
+++ b/docs/intro/architecture.mdx
@@ -9,7 +9,7 @@ CowAgent 2.0 has evolved from a simple chatbot into a super intelligent assistan
 
 CowAgent's architecture consists of the following core modules:
 
-<img src="https://cdn.jsdelivr.net/gh/zhayujie/cowagent-assets@main/architecture/en/architecture.jpg" alt="CowAgent Architecture" />
+<img src="https://cdn.jsdelivr.net/gh/zhayujie/cowagent-assets@main/architecture/en/architecture.png" alt="CowAgent Architecture" />
 
 | Module | Description |
 | --- | --- |
diff --git a/docs/ja/README.md b/docs/ja/README.md
index afe51342..1ae5cb84 100644
--- a/docs/ja/README.md
+++ b/docs/ja/README.md
@@ -48,7 +48,7 @@ CowAgent は軽量でデプロイしやすく、拡張性に優れています
 
 ## 🏗️ アーキテクチャ
 
-<img src="https://cdn.jsdelivr.net/gh/zhayujie/cowagent-assets@main/architecture/en/architecture.jpg" alt="CowAgent Architecture" width="750"/>
+<img src="https://cdn.jsdelivr.net/gh/zhayujie/cowagent-assets@main/architecture/en/architecture.png" alt="CowAgent Architecture" width="750"/>
 
 CowAgent は完全な **Agent Harness** です：メッセージは各種**チャネル**から流入し、**Agent Core** が記憶・知識・利用可能なツール／Skill を組み合わせてタスクを計画・判断、**モデル**が応答を生成し、結果は元のチャネルに返されます。各レイヤーは疎結合で、独立して拡張可能です。
 
diff --git a/docs/ja/intro/architecture.mdx b/docs/ja/intro/architecture.mdx
index 5e8b202b..682b407e 100644
--- a/docs/ja/intro/architecture.mdx
+++ b/docs/ja/intro/architecture.mdx
@@ -9,7 +9,7 @@ CowAgent 2.0 は、シンプルなチャットボットから、自律的な思
 
 CowAgent のアーキテクチャは以下のコアモジュールで構成されています：
 
-<img src="https://cdn.jsdelivr.net/gh/zhayujie/cowagent-assets@main/architecture/en/architecture.jpg" alt="CowAgent Architecture" />
+<img src="https://cdn.jsdelivr.net/gh/zhayujie/cowagent-assets@main/architecture/en/architecture.png" alt="CowAgent Architecture" />
 
 | モジュール | 説明 |
 | --- | --- |