diff --git a/external-worker/requirements.txt b/external-worker/requirements.txt
index 129f62e..2283d56 100644
--- a/external-worker/requirements.txt
+++ b/external-worker/requirements.txt
@@ -28,7 +28,7 @@ jupyter-console==6.0.0
 jupyter-core==4.5.0
 jupytext==1.2.1
 MarkupSafe==1.1.1
-mistune==0.8.4
+mistune==2.0.3
 multidict==4.5.2
 nbconvert==5.5.0
 nbformat==4.4.0