diff --git a/build/requirements.txt b/build/requirements.txt
index 5e9bbe3..5929135 100644
--- a/build/requirements.txt
+++ b/build/requirements.txt
@@ -42,7 +42,7 @@ kiwisolver==1.0.1
 Markdown==2.6.11
 MarkupSafe==1.1.1
 matplotlib==3.0.3
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==4.3.0
 nbconvert==5.4.1
 nbformat==4.4.0