diff --git a/requirements.txt b/requirements.txt
index f589382..0a8b35f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 -i https://pypi.org/simple
 asn1crypto==0.24.0
 cffi==1.12.3
-cryptography==2.7
+cryptography==39.0.1
 enum34==1.1.6
 futures==3.3.0 ; python_version < '3.2'
 grpcio==1.24.0