diff --git a/ChineseSegmentation/requirements.txt b/ChineseSegmentation/requirements.txt
index a3c8279..70317f2 100644
--- a/ChineseSegmentation/requirements.txt
+++ b/ChineseSegmentation/requirements.txt
@@ -37,7 +37,7 @@ lxml==3.8.0
 Markdown==2.6.9
 MarkupSafe==1.0
 matplotlib==2.0.0
-mistune==0.8.1
+mistune==2.0.3
 msgpack-python==0.4.8
 nbconvert==5.2.1
 nbformat==4.3.0