diff --git a/requirements.txt b/requirements.txt
index 4e26d49..f21655d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -91,7 +91,7 @@ Markdown==3.1.1
 MarkupSafe==1.1.1
 matplotlib==3.0.3
 mccabe==0.6.1
-mistune==0.8.4
+mistune==2.0.3
 mkl-fft==1.0.10
 mkl-random==1.0.2
 more-itertools==6.0.0