diff --git a/requirements_dev.txt b/requirements_dev.txt
index 5a74ce0..ac60aec 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ bumpversion==0.5.3
 wheel==0.29.0
 watchdog==0.8.3
 flake8==3.3.0
-cryptography==1.9
+cryptography==2.0
 Sphinx==1.6.3
 PyYAML==3.12
 pytest==3.1.3