diff --git a/requirements.txt b/requirements.txt
index badb0a8..cf492aa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -54,7 +54,7 @@ mahotas==1.4.9
 Markdown==3.0.1
 MarkupSafe==1.1.0
 matplotlib==3.0.2
-mistune==0.8.4
+mistune==2.0.3
 mock==2.0.0
 mpmath==1.1.0
 nbconvert==5.3.1