diff --git a/requirements.txt b/requirements.txt
index fa28f4a..988dc8b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -52,7 +52,7 @@ ll-xist==5.50
 Markdown==3.1
 MarkupSafe==1.1.1
 matplotlib==3.0.3
-mistune==0.8.4
+mistune==2.0.3
 mkl-fft==1.0.6
 mkl-random==1.0.1.1
 mock==2.0.0