diff --git a/requirements.txt b/requirements.txt
index 599600f..d3943d3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -41,7 +41,7 @@ jsonschema==3.0.1
 jupyter-client==5.3.1
 jupyter-core==4.5.0
 MarkupSafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 nbconvert==5.5.0
 nbformat==4.4.0
 notebook==5.7.8