diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index bd866e0..e552a73
--- a/requirements.txt
+++ b/requirements.txt
@@ -54,7 +54,7 @@ mpi4py==3.0.0
 mujoco-py==1.50.1.56
 nbconvert==5.3.1
 nbformat==4.4.0
-notebook==5.5.0
+notebook==6.4.10
 numexpr==2.6.5
 numpy==1.15.0
 opencv-python==3.4.1.15