diff --git a/website/builder/verify_updates.py b/website/builder/verify_updates.py
index 288137d4..c17143af 100644
--- a/website/builder/verify_updates.py
+++ b/website/builder/verify_updates.py
@@ -30,8 +30,10 @@ assert result.returncode == 0, result.stderr
assert digest(OUTPUT / 'asset-manifest.json') == first_manifest, '相同输入的两次构建不一致'
report = json.loads((BASE / 'dist-report.json').read_text())
-url, image = next((url, path) for url, path in report['imageReplacements'].items()
- if path.startswith('/notes/pics/') and path.endswith('.png'))
+# 优先选 PNG；笔记的旧外链图片都已重画为本地 PNG 时，剩下的多是 GIF，用同类型的图片替换
+candidates = [(url, path) for url, path in report['imageReplacements'].items() if path.startswith('/notes/pics/')]
+url, image = next((item for item in candidates if item[1].endswith('.png')), candidates[0])
+suffix = Path(image).suffix
image_name = unquote(image).lstrip('/')
note = next(path for path in (SOURCE / 'notes').glob('*.md') if url in path.read_text())
note_name = note.relative_to(SOURCE)
@@ -44,7 +46,7 @@ with tempfile.TemporaryDirectory(prefix='.update-check-', dir=BASE) as temp:
shutil.copytree(SOURCE, source)
with (source / note_name).open('a') as handle:
handle.write('\n\n## 本地验证更新\n\n本地同步验证示例词：这是未上传的更新测试。\n')
- replacement = next(path for path in (SOURCE / 'notes/pics').glob('*.png') if digest(path) != original_image)
+ replacement = next(path for path in (SOURCE / 'notes/pics').glob('*' + suffix) if digest(path) != original_image)
shutil.copyfile(replacement, source / image_name)
shutil.copyfile(replacement, source / 'notes/pics/local-validation-new.png')
(source / 'notes/本地新增验证.md').write_text('# 本地新增验证\n\n仅在测试副本中生成。\n\n\n')
diff --git a/website/templates/index.html b/website/templates/index.html
index 6300c850..913dabcd 100644
--- a/website/templates/index.html
+++ b/website/templates/index.html
@@ -13,17 +13,17 @@
正在载入 CS-Notes…
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