diff --git a/luigi/requirements.txt b/luigi/requirements.txt
old mode 100755
new mode 100644
index 74dca85..54ecf26
--- a/luigi/requirements.txt
+++ b/luigi/requirements.txt
@@ -6,7 +6,7 @@ certifi==2017.11.5
 chardet==3.0.4
 chrome-gnome-shell==0.0.0
 colorama==0.3.9
-cryptography==2.1.4
+cryptography==3.2
 cupshelpers==1.0
 cycler==0.10.0
 decorator==4.1.2