diff --git a/requirements.txt b/requirements.txt
index e742df2..a23505d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ schematics==2.0.1 # BSD 3-clause
 simple-settings==0.12.0 # MIT
 arrow==0.10.0 # Apache 2.0
 pyvmomi==6.5.0.2017.5-1 # Apache 2.0
-cryptography==2.1.4 # Apache 2.0 or BSD
+cryptography==2.3 # Apache 2.0 or BSD
 passlib==1.7.1 # BSD-3-Clause
 bcrypt==3.1.4 # Apache 2.0
 pygithub==1.35 # LGPL