diff --git a/cli/requirements.txt b/cli/requirements.txt
index b4336fa..7680d9f 100644
--- a/cli/requirements.txt
+++ b/cli/requirements.txt
@@ -55,7 +55,7 @@ lxml==4.3.3
 Markdown==3.1
 MarkupSafe==1.1.1
 matplotlib==3.0.3
-mistune==0.8.4
+mistune==2.0.3
 mock==2.0.0
 msgpack==0.6.1
 nbconvert==5.5.0