diff --git a/requirements-dev.txt b/requirements-dev.txt
index 8ba513f..b4ecb24 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -12,7 +12,7 @@ aiopg[sa]==0.15.0
 aioredis==1.2.0
 hiredis==1.0.0
 passlib==1.7.1
-cryptography==2.4.2
+cryptography==2.7
 aiohttp==3.4.4
 pytest-aiohttp==0.3.0
 pyjwt==1.7.1