diff --git a/requirements.txt b/requirements.txt
index 748defb..77dc0a6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -51,7 +51,7 @@ kiwisolver==1.1.0
 Markdown==3.1.1
 MarkupSafe==1.1.1
 matplotlib==3.0.3
-mistune==0.8.4
+mistune==2.0.3
 mkl-fft==1.0.12
 mkl-random==1.0.2
 mock==3.0.5