diff --git a/chapter_paperbook/index.assets/book_jd_link.jpg b/chapter_paperbook/index.assets/book_jd_link.jpg
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diff --git a/chapter_paperbook/index.html b/chapter_paperbook/index.html
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--- a/chapter_paperbook/index.html
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@@ -3592,7 +3592,7 @@
 <p>“印刷质量”和“价格”就像算法中的“时间效率”和“空间效率”，难以两全。而我认为，“印刷质量”对应的是“时间效率”，更应该被注重。</p>
 </div>
 <h2 id="_3">购买链接<a class="headerlink" href="#_3" title="Permanent link">&para;</a></h2>
-<p>如果你对纸质书感兴趣，可以考虑入手一本。我们为大家争取到了新书 5 折优惠，请见<a href="https://3.cn/-1Wwj1jq">此链接</a>或扫描以下二维码：</p>
+<p>如果你对纸质书感兴趣，可以考虑入手一本。我们为大家争取到了新书 5 折优惠，请见<a href="https://3.cn/1X-qmTD3">此链接</a>或扫描以下二维码：</p>
 <p><a class="glightbox" href="index.assets/book_jd_link.jpg" data-type="image" data-width="100%" data-height="auto" data-desc-position="bottom"><img alt="" class="animation-figure" src="index.assets/book_jd_link.jpg" /></a></p>
 <h2 id="_4">尾记<a class="headerlink" href="#_4" title="Permanent link">&para;</a></h2>
 <p>起初，我低估了纸质书出版的工作量，以为只要维护好了开源项目，纸质版就可以通过某些自动化手段生成出来。实践证明，纸质书的生产流程与开源项目的更新机制存在很大的不同，两者之间的转化需要做许多额外工作。</p>
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