diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index bd866e0..0b5761a
--- a/requirements.txt
+++ b/requirements.txt
@@ -52,7 +52,7 @@ mistune==0.8.3
 more-itertools==4.2.0
 mpi4py==3.0.0
 mujoco-py==1.50.1.56
-nbconvert==5.3.1
+nbconvert==6.5.1
 nbformat==4.4.0
 notebook==5.5.0
 numexpr==2.6.5