diff --git a/setup.py b/setup.py
index 0cc81a1b4..2da10baab 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@ with open(os.path.join(here, 'README.rst'), encoding='utf-8') as f:
 deps = {
     "pyasn1>=0.1.9, <0.2",
     "pyOpenSSL>=0.15.1, <0.16",
-    "cryptography>=1.1.1, <1.3",
+    "cryptography>=1.2.1, <1.3",
     "passlib>=1.6.5, <1.7",
     "hpack>=2.0.1, <2.1",
     "six>=1.10.0, <1.11",