diff --git a/requirements.txt b/requirements.txt
index ca86a19..bb2ab16 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ lazy-object-proxy==1.4.3
 MarkupSafe==1.1.1
 matplotlib==3.1.2
 mccabe==0.6.1
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==8.0.2
 mpi4py==3.0.3
 nbconvert==5.6.1