diff --git a/OLPS_python/requirements.txt b/OLPS_python/requirements.txt
index 328ef4a..786e143 100644
--- a/OLPS_python/requirements.txt
+++ b/OLPS_python/requirements.txt
@@ -47,7 +47,7 @@ mccabe==0.6.1
 mistune==0.8.4
 mkl-fft==1.0.10
 mkl-random==1.0.2
-nbconvert==5.4.1
+nbconvert==6.5.1
 nbformat==4.4.0
 networkx==2.2
 notebook==5.7.8