diff --git a/requirements.txt b/requirements.txt
index 18be080..c226be9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,5 +2,5 @@ pytest==5.1.2
 Flask==1.1.1
 pubnub==4.1.6
 requests==2.22.0
-cryptography==2.7
+cryptography==39.0.1
 Flask-Cors==3.0.8