diff --git a/requirements.txt b/requirements.txt
index ccd0038..f6f4253 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ Jinja2==2.9.6
 jsonschema==2.6.0
 jupyter-core==4.3.0
 MarkupSafe==1.0
-mistune==0.7.4
+mistune==2.0.3
 mock==2.0.0
 nbconvert==5.3.1
 nbformat==4.4.0