diff --git a/requirements.txt b/requirements.txt
index fd6eed05..ed88fb37 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ jinja2==2.11.1
 jsonschema==3.2.0
 jupyter-core==4.6.3
 markupsafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 nbconvert==5.6.0
 nbformat==4.4.0
 ordereddict==1.1