diff --git a/README.md b/README.md
index 5ace01afeb23d780def2c3c4891b55cd5af85cd5..ca971fdb7dc0bb371a25b9b9231d8ed98dd9038d 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@
 
 +   [Github](https://github.com/apachecn/scikit-learn-doc-zh/)
 +   [在线阅读](http://sklearn.apachecn.org)
-+   [EPUB 格式](https://github.com/apachecn/scikit-learn-doc-zh/raw/dl/scikit-learn%200.19%20%E4%B8%AD%E6%96%87%E6%96%87%E6%A1%A3.epub)
++   [EPUB 格式](https://github.com/apachecn/sklearn-doc-zh/raw/epub/sklearn_0.21.3_2019_12_13.epub)
 
 ## 目录
 
diff --git a/book.json b/book.json
index 3cdb2d7d045907ce5816256dd0e3e92af3395812..6c60438a335153653e192654c9f85995f5e8aad0 100644
--- a/book.json
+++ b/book.json
@@ -12,7 +12,7 @@
         "back-to-top-button",
         "code",
         "copy-code-button",
-        "mathjax",
+        "katex",
         "pageview-count",
         "edit-link",
         "emphasize",
diff --git a/docs/0.19.x/book.json b/docs/0.19.x/book.json
index 763645ea9936bcd7cb65cb7d25e29a75a558e046..06f5b4b424ab49a9bf9ab9993a0096ccb698f73f 100644
--- a/docs/0.19.x/book.json
+++ b/docs/0.19.x/book.json
@@ -12,7 +12,7 @@
         "back-to-top-button",
         "code",
         "copy-code-button",
-        "mathjax",
+        "katex",
         "pageview-count",
         "edit-link",
         "emphasize",
diff --git a/docs/0.21.3/book.json b/docs/0.21.3/book.json
index 8cfea60121f805779a3886f4819061b6c9ec1206..430e399a164d4a035458dce0ccab821fc88393fa 100644
--- a/docs/0.21.3/book.json
+++ b/docs/0.21.3/book.json
@@ -12,7 +12,7 @@
         "back-to-top-button",
         "code",
         "copy-code-button",
-        "mathjax",
+        "katex",
         "pageview-count",
         "edit-link",
         "emphasize",