diff --git a/requirements.txt b/requirements.txt
index dd4a965..6c8a553 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ jsonschema==3.2.0
 jupyter-client==6.0.0
 jupyter-core==4.6.3
 MarkupSafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 nbconvert==5.6.1
 nbformat==5.0.4
 notebook==6.0.3