diff --git a/requirements_dev.txt b/requirements_dev.txt
index ff9b731..fe25fb1 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ flake8>=2.6.0
 tox==3.0.0
 coverage==4.5.1
 Sphinx>=1.6
-cryptography==2.1.4
+cryptography==2.2.2
 PyYAML==3.12
 requests>=2.7.0
 lxml>=1.3