diff --git a/requirements.txt b/requirements.txt
index 8288319..d9ee256 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -50,7 +50,7 @@ lz4==2.1.2
 Markdown==3.0.1
 MarkupSafe==1.1.0
 matplotlib==3.0.2
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==4.3.0
 mpi4py==3.0.0
 nbconvert==5.4.0