diff --git a/requirements.txt b/requirements.txt
index a145e6e..bce3024 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 cffi==1.14.0
 click==7.1.2
-cryptography==2.9.2
+cryptography==39.0.1
 Flask==1.1.2
 gevent==20.6.2
 greenlet==0.4.16