diff --git a/dendronet_legacy/patric_application/patric_tree_storage/requirements.txt b/dendronet_legacy/patric_application/patric_tree_storage/requirements.txt
index c984c64..8343826 100644
--- a/dendronet_legacy/patric_application/patric_tree_storage/requirements.txt
+++ b/dendronet_legacy/patric_application/patric_tree_storage/requirements.txt
@@ -35,7 +35,7 @@ Markdown==3.0.1
 MarkupSafe==1.1.1
 matplotlib==3.0.3
 mistune==0.8.4
-nbconvert==5.5.0
+nbconvert==6.5.1
 nbformat==4.4.0
 networkx==2.3
 newick==0.9.2