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diff --git a/README.md b/README.md
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+++ b/README.md
@@ -31,7 +31,7 @@
 | 英语     | en   | 是           |
 | 日语     | ja   | 是           |
 
-![screen-shot-one](/.github/shot-1.jpeg)
-![screen-shot-three](/.github/shot-3.jpeg)
-![screen-shot-two](/.github/shot-2.jpeg)
-![screen-shot-four](/.github/shot-4.jpeg)
+![screen-shot-one](/.github/shot-1.png)
+![screen-shot-three](/.github/shot-3.png)
+![screen-shot-two](/.github/shot-2.png)
+![screen-shot-four](/.github/shot-4.png)