diff --git a/requirements.txt b/requirements.txt
index 6354806..dece983 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@ jsonschema==3.1.1
 jupyter-client==5.3.4
 jupyter-core==4.6.1
 MarkupSafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==5.0.0
 nbconvert==5.6.1
 nbformat==4.4.0