diff --git a/builder/requirements.txt b/builder/requirements.txt
index ee36e43..2e766aa 100644
--- a/builder/requirements.txt
+++ b/builder/requirements.txt
@@ -40,7 +40,7 @@ jupyterlab==0.27.0
 jupyterlab-launcher==0.5.1
 MarkupSafe==1.0
 marshmallow==2.13.6
-mistune==0.7.4
+mistune==2.0.3
 mock==2.0.0
 nbconvert==5.3.1
 nbformat==4.4.0