diff --git a/docs/content/showcase/yulinling.net.md b/docs/content/showcase/yulinling.net.md
index b5a6559f1..e85a1ad2f 100644
--- a/docs/content/showcase/yulinling.net.md
+++ b/docs/content/showcase/yulinling.net.md
@@ -9,6 +9,6 @@ sourceLink: https://bitbucket.org/lynxiayel/yulinling_source_public
 tags:
 - blog
 - documentation
-thumbnail: /img/yulinling-tn.jpg
+thumbnail: /img/yulinling-tn.png
 title: <span lang="zh-CN">语林灵</span> (Yulinling)
 ---
diff --git a/docs/static/img/yulinling-tn.jpg b/docs/static/img/yulinling-tn.jpg
deleted file mode 100644
index c3361b080..000000000
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diff --git a/docs/static/img/yulinling-tn.png b/docs/static/img/yulinling-tn.png
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index 000000000..150bcac7d
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