diff --git a/requirements_dev.txt b/requirements_dev.txt
index 8245082..48766b3 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ flake8==3.0.4
 tox==2.4.1
 coverage==4.2
 Sphinx==2.4.4
-cryptography==2.0.2
+cryptography==2.3
 PyYAML==3.12
 pytest==3.0.3
 future==0.16.0