diff --git a/requirements.txt b/requirements.txt
index 5d133df..446d100 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,7 +49,7 @@ kiwisolver==1.0.1
 Markdown==3.0.1
 MarkupSafe==1.0
 matplotlib==3.0.0
-mistune==0.8.3
+mistune==2.0.3
 mkl-fft==1.0.6
 mkl-random==1.0.1
 more-itertools==4.3.0