diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index e2d90f3..8fddb13
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,7 +29,7 @@ MarkupSafe==1.1.1
 matplotlib==3.1.2
 mistune==0.8.4
 more-itertools==8.1.0
-nbconvert==5.6.1
+nbconvert==6.5.1
 nbformat==5.0.3
 notebook==6.0.1
 numba==0.47.0