diff --git a/requirements-dev.txt b/requirements-dev.txt
index db24439..31120ec 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -11,7 +11,7 @@ aiopg[sa]==0.15.0
 aioredis==1.1.0
 hiredis==0.2.0
 passlib==1.7.1
-cryptography==2.2.2
+cryptography==2.3.1
 aiohttp==3.3.2
 pytest-aiohttp==0.3.0
 pyjwt==1.6.4
\ No newline at end of file