diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 9c903fa..a2030b5
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ cffi==1.11.2
 configobj==5.0.6
 configparser==3.5.0
 crcmod==1.7
-cryptography==2.1.4
+cryptography==2.3
 cupy==2.0.0b1
 cycler==0.10.0
 Cython==0.27.3