diff --git a/requirements.txt b/requirements.txt
index 16d3d08..415ded0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,3 +6,4 @@
 
 tempest>=12.1.0  # Apache-2.0
 tempest-lib>=0.14.0  # Apache-2.0
+cryptography!=1.3.0,>=1.0 # BSD/Apache-2.0