diff --git a/requirements.txt b/requirements.txt
index 29f60f8..553c820 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -42,7 +42,7 @@ Logbook==1.5.3
 logzero==1.5.0
 lxml==4.4.2
 MarkupSafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==8.1.0
 multidict==4.7.5
 nbconvert==5.6.1