diff --git a/requirements-frozen.txt b/requirements-frozen.txt
index 2cfb39d..53326b1 100644
--- a/requirements-frozen.txt
+++ b/requirements-frozen.txt
@@ -68,7 +68,7 @@ kombu==4.2.1
 Markdown==3.0.1
 MarkupSafe==1.0
 matplotlib==3.0.0
-mistune==0.8.4
+mistune==2.0.3
 multidict==4.4.2
 nbconvert==5.4.0
 nbformat==4.4.0