diff --git a/requirements.txt b/requirements.txt
index 7ecfb30..12425ff 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ jupyter-core==4.6.1
 jupyterlab==1.2.5
 jupyterlab-server==1.0.6
 MarkupSafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 more-itertools==8.0.2
 nb-conda-kernels==2.2.2
 nbconvert==5.6.1