diff --git a/requirements_dev.txt b/requirements_dev.txt
index 6f904af..143be73 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ flake8==3.5.0
 tox==3.1.1
 coverage==4.5.1
 Sphinx==1.7.5
-cryptography==2.2.2
+cryptography==2.6.1
 PyYAML==3.13
 pytest==3.6.3
 click==6.7