diff --git a/requirements_old2.txt b/requirements_old2.txt
index 40ed458..e7eeaa0 100644
--- a/requirements_old2.txt
+++ b/requirements_old2.txt
@@ -39,7 +39,7 @@ jsonschema==3.0.0
 #lxml==4.3.1
 MarkupSafe==1.1.1
 mistune==0.8.4
-nbconvert==5.4.1
+nbconvert==6.3.0
 nbformat==4.4.0
 nbsphinx==0.4.2
 numpy==1.16.2