diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index e6e6e60..722b35c
--- a/requirements.txt
+++ b/requirements.txt
@@ -31,7 +31,7 @@ more-itertools==7.2.0
 nbconvert==5.6.1
 nbformat==5.0.4
 networkx==2.2
-notebook==6.0.3
+notebook==6.4.12
 numpy==1.15.1
 packaging==19.1
 pandocfilters==1.4.2