diff --git a/requirements_dev.txt b/requirements_dev.txt
index f81f98a..3aef427 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ flake8==3.5.0
 tox==3.0.0
 coverage==4.5.1
 Sphinx==1.7.1
-cryptography==2.1.4
+cryptography==2.2.2
 PyYAML==3.12
 pytest==3.4.2
 pytest-runner==4.2