diff --git a/entity_linkage/normalization/sgtb/requirements.txt b/entity_linkage/normalization/sgtb/requirements.txt
index d5d7703d..b0d5eda1 100644
--- a/entity_linkage/normalization/sgtb/requirements.txt
+++ b/entity_linkage/normalization/sgtb/requirements.txt
@@ -95,7 +95,7 @@ mpmath==0.19
 msgpack-python==0.4.8
 multipledispatch==0.4.9
 navigator-updater==0.1.0
-nbconvert==5.3.1
+nbconvert==6.5.1
 nbformat==4.4.0
 networkx==2.2
 nltk==3.4