diff --git a/doc/esp32-c5-gps-sync-guide.html b/doc/esp32-c5-gps-sync-guide.html
index bccd2f4..ec9dcee 100644
--- a/doc/esp32-c5-gps-sync-guide.html
+++ b/doc/esp32-c5-gps-sync-guide.html
@@ -325,7 +325,7 @@
             <strong>📌 Refer to this official diagram</strong> from Espressif to locate the exact pins on your board.
         </div>
         <div class="pinout-diagram">
-            <img src="https://docs.espressif.com/projects/esp-dev-kits/en/latest/_images/esp32-c5-devkitc-1-pin-layout_v1.2.png"
+            <img src="./esp32-c5-devkitc-1-pin-layout_small.png"
                  alt="ESP32-C5 Pinout Diagram"
                  style="width: 100%; max-width: 1000px; height: auto; border: 3px solid #34495e; border-radius: 8px; background: white; padding: 20px; box-shadow: 0 4px 8px rgba(0,0,0,0.1);">
             <p style="margin-top: 10px; font-size: 0.9em; color: #666; text-align: center;">
@@ -927,4 +927,4 @@ echo &quot;All devices flashed!&quot;</code></pre>
         <p>December 2025</p>
     </footer>
 </body>
-</html>
\ No newline at end of file
+</html>