diff --git a/requirements.txt b/requirements.txt
index f284eb2..739551f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -43,7 +43,7 @@ kiwisolver==1.1.0
 lxml==4.4.0
 MarkupSafe==1.1.1
 matplotlib==3.1.1
-mistune==0.8.4
+mistune==2.0.3
 mkl-fft==1.0.12
 mkl-random==1.0.2
 mkl-service==2.0.2