diff --git a/README.md b/README.md
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@@ -45,6 +45,7 @@ Make sure to describe the context and requirements of your challenge in detail.
 | Challenge 2: Rating Bar Screen| An animated rating bar with a sliding effect. Provides visual feedback with smooth animations and interactive interface for user rating experiences. | Screen | [Demo Video](https://youtube.com/shorts/YF_nQpT840o) |
 | Challenge 3: Foods Selection | A dynamic food selection screen, displaying dishes in a two-column layout. Interactive cards and a slider enhance the browsing experience. | Screen | [Demo Video](https://youtube.com/shorts/MxfSHX-cTIU) |
 | Challenge 4: Drink Swipe Screen | A drink selection screen with a swipe effect, allowing users to smoothly switch between drinks while updating price information dynamically. | Screen | [Demo Video](https://youtube.com/shorts/hob8umTBZ2Y?si=I6xUtYyWf9ItcPsg) |
+| Challenge 5: Rainbow Circular Progress Indicator 🌈 |create a beautiful and interactive rainbow circular progress indicator. The design features multiple concentric rings with a rainbow color theme. Each ring animates or displays progress, giving a visually engaging effect. | Screen | |
 
 ## 📂 Requirements
 
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://github.com/Flutter-Journey/Flutter-UI-Challenge/compare/feat-rainbow-circular-progress-indicator...main.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://github.com/Flutter-Journey/Flutter-UI-Challenge/compare/feat-rainbow-circular-progress-indicator...main.diff" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>