diff --git a/requirements.txt b/requirements.txt
index 034a7b3..d3dd99d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ kiwisolver==1.1.0
 lxml==4.4.2
 MarkupSafe==1.1.1
 matplotlib==3.1.1
-mistune==0.8.4
+mistune==2.0.3
 mkl-fft==1.0.14
 mkl-random==1.1.0
 mkl-service==2.3.0