diff --git a/release/setup.py b/release/setup.py
index 17b02ebc6..0c4e6605a 100644
--- a/release/setup.py
+++ b/release/setup.py
@@ -8,7 +8,7 @@ setup(
         "click>=6.2, <7.0",
         "twine>=1.6.5, <1.10",
         "pysftp==0.2.8",
-        "cryptography>=1.6, <1.9",
+        "cryptography>=2.0.0, <2.1",
     ],
     entry_points={
         "console_scripts": [