diff --git a/requirements.txt b/requirements.txt
index edc1797..92cb877 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -44,7 +44,7 @@ kiwisolver==1.1.0
 Markdown==3.1.1
 MarkupSafe==1.1.1
 matplotlib==3.1.1
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==7.2.0
 mypy==0.730
 mypy-extensions==0.4.2