diff --git a/requirements.txt b/requirements.txt
index 2dc3d29..53d9a8e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ jupyterlab-server==2.1.2
 kiwisolver==1.3.1
 MarkupSafe==1.1.1
 matplotlib==3.3.3
-mistune==0.8.4
+mistune==2.0.3
 mkl-fft==1.2.0
 mkl-random==1.1.1
 mkl-service==2.3.0