diff --git a/requirements.txt b/requirements.txt
index 26ae68d..5b34861 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -41,7 +41,7 @@ kiwisolver==1.0.1
 language-selector==0.1
 MarkupSafe==1.0
 matplotlib==2.2.2
-mistune==0.8.3
+mistune==2.0.3
 mpmath==1.0.0
 mypy==0.610
 nbconvert==5.3.1