diff --git a/setup.py b/setup.py
index f21c906..03e9a5c 100644
--- a/setup.py
+++ b/setup.py
@@ -35,6 +35,6 @@ setup(
     ],
     keywords='cryptography noiseprotocol noise security',
     packages=find_packages(exclude=['contrib', 'docs', 'tests', 'examples']),
-    install_requires=['cryptography==2.1.4'],
+    install_requires=['cryptography>=2.1.4'],
     python_requires='~=3.5', # we like 3.5, 3.6, and beyond, but not 4.0
 )