diff --git a/README.md b/README.md
index a9fd61d1..abc32379 100644
--- a/README.md
+++ b/README.md
@@ -85,7 +85,7 @@
 
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-<div align="center"><img width="500px" src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/other/公众号海报3.png"></img></div>
+<div align="center"><img width="500px" src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/other/公众号海报4.png"></img></div>
 
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