diff --git a/requirements/_frozen_env.txt b/requirements/_frozen_env.txt
index 07cdfa7..4ae14ea 100644
--- a/requirements/_frozen_env.txt
+++ b/requirements/_frozen_env.txt
@@ -41,7 +41,7 @@ mccabe==0.6.1
 mistune==0.8.4
 mock==3.0.5
 more-itertools==7.0.0
-nbconvert==5.5.0
+nbconvert==6.5.1
 nbformat==4.4.0
 networkx==2.3
 nose==1.3.7