diff --git a/requirements_dev.txt b/requirements_dev.txt
index 65063cf..5cedff7 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,6 +5,5 @@ flake8==2.4.1
 tox==2.1.1
 coverage==4.0
 Sphinx==1.3.1
-cryptography==1.0.1
 PyYAML==3.11
 pytest==2.7.0