diff --git a/README.md b/README.md
index 412a4fd..d4b8695 100644
--- a/README.md
+++ b/README.md
@@ -224,9 +224,9 @@ Issues, feature requests, and PRs are welcome. Some areas where contributions wo
 
 <a href="https://star-history.com/#JackChen-me/open-multi-agent&Date">
  <picture>
-   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=JackChen-me/open-multi-agent&type=Date&theme=dark&v=20260403" />
-   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/svg?repos=JackChen-me/open-multi-agent&type=Date&v=20260403" />
-   <img alt="Star History Chart" src="https://api.star-history.com/svg?repos=JackChen-me/open-multi-agent&type=Date&v=20260403" />
+   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=JackChen-me/open-multi-agent&type=Date&theme=dark" />
+   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/svg?repos=JackChen-me/open-multi-agent&type=Date" />
+   <img alt="Star History Chart" src="https://api.star-history.com/svg?repos=JackChen-me/open-multi-agent&type=Date" />
  </picture>
 </a>