diff --git a/requirements.txt b/requirements.txt
index b79d7dd..343b68e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ certifi==2019.6.16
 cffi==1.12.3
 chardet==3.0.4
 colorama==0.3.9
-cryptography==2.7
+cryptography==39.0.1
 docutils==0.15.2
 fabric==2.5.0
 htmlmin==0.1.12