diff --git a/README.md b/README.md
index 521874f..d443c33 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@
 
 <https://mengxiong10.github.io/vue2-datepicker/index.html>
 
-![image](https://github.com/mengxiong10/vue2-datepicker/raw/master/screenshot/demo.PNG)
+![image](https://github.com/mengxiong10/vue2-datepicker/raw/master/screenshot/demo.png)
 
 ## Install
 
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 917fc38..03832a2 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -21,7 +21,7 @@
 
 <https://mengxiong10.github.io/vue2-datepicker/index.html>
 
-![image](https://github.com/mengxiong10/vue2-datepicker/raw/master/screenshot/demo.PNG)
+![image](https://github.com/mengxiong10/vue2-datepicker/raw/master/screenshot/demo.png)
 
 ## 安装
 
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