diff --git a/requirements.txt b/requirements.txt
index 97361ca..fda9b43 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ MarkupSafe==1.1.1
 marshmallow==2.19.1
 marshmallow-polyfield==3.2
 matplotlib==3.0.3
-mistune==0.8.4
+mistune==2.0.3
 mpmath==1.1.0
 nbconvert==5.4.1
 nbformat==4.4.0