diff --git a/requirements.txt b/requirements.txt
index 51bf8d2..42e6086 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -55,7 +55,7 @@ lxml==4.6.3
 Markdown==3.1.1
 MarkupSafe==1.1.1
 matplotlib==3.0.2
-mistune==0.8.4
+mistune==2.0.3
 mock==3.0.5
 more-itertools==7.2.0
 nbconvert==5.6.0