diff --git a/requirements.txt b/requirements.txt
index 1e94a49..44493c2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -40,7 +40,7 @@ kiwisolver==1.2.0
 Markdown==3.2.2
 MarkupSafe==1.1.1
 matplotlib==3.3.1
-mistune==0.8.4
+mistune==2.0.3
 mock==4.0.2
 nbconvert==5.6.1
 nbformat==5.0.7