diff --git a/requirements.txt b/requirements.txt
index 7fb68ed..600dcea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -40,7 +40,7 @@ mailmerge==1.7.9
 MarkupSafe==1.1.0
 matplotlib==3.0.2
 mccabe==0.6.1
-mistune==0.8.4
+mistune==2.0.3
 mock==2.0.0
 more-itertools==5.0.0
 nbconvert==5.3.1