diff --git a/external-worker/requirements.txt b/external-worker/requirements.txt
index 129f62e..a6d1469 100644
--- a/external-worker/requirements.txt
+++ b/external-worker/requirements.txt
@@ -30,7 +30,7 @@ jupytext==1.2.1
 MarkupSafe==1.1.1
 mistune==0.8.4
 multidict==4.5.2
-nbconvert==5.5.0
+nbconvert==6.5.1
 nbformat==4.4.0
 notebook==6.4.1
 pandocfilters==1.4.2