diff --git a/requirements.txt b/requirements.txt
index ecbd774..c7a090c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -47,7 +47,7 @@ mkl-random==1.1.0
 mkl-service==2.3.0
 msgpack==0.6.1
 multidict==4.7.4
-nbconvert==5.6.1
+nbconvert==6.5.1
 nbformat==5.0.4
 nc-time-axis==1.2.0
 netCDF4==1.5.3