diff --git a/requirements.txt b/requirements.txt
index 3167cbd9..fba18d34 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ websockets==8.0.2
 # p2p
 pytest>=3.6,<3.7
 pytest-asyncio==0.9.0
-cryptography==2.3.1
+cryptography==3.2
 upnpclient==0.0.8
 netifaces==0.10.7
 rlp>=1.0.0,<2.0.0