diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index e11e04f..fb9419b
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ jupyter-core==4.3.0
 MarkupSafe==1.0
 matplotlib==2.0.0
 mistune==0.8.1
-nbconvert==5.1.1
+nbconvert==6.5.1
 nbformat==4.3.0
 notebook>=5.7.8
 numpy==1.12.1