diff --git a/requirements-dev.txt b/requirements-dev.txt
index cedbad1..feb1402 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -12,7 +12,7 @@ aiopg[sa]==1.0.0
 aioredis==1.3.1
 hiredis==1.0.1
 passlib==1.7.2
-cryptography==2.8
+cryptography==2.9
 aiohttp==3.6.2
 pytest-aiohttp==0.3.0
 pyjwt==1.7.1