diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index c4e4443..1214fd9
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ certifi==2017.7.27.1
 cffi==1.9.1
 chardet==3.0.4
 chargebee==2.3.7
-cryptography==2.0.3
+cryptography==3.2
 decorator==4.1.2
 Django==1.11.6
 django-celery==3.2.2