diff --git a/requirements.txt b/requirements.txt
index c287ccd..864fada 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,7 +7,7 @@ asn1crypto==0.24.0
 certifi==2018.4.16
 cffi==1.11.5
 chardet==3.0.4
-cryptography==2.2.2
+cryptography==39.0.1
 idna==2.6
 ntlm-auth==1.1.0
 numpy==1.14.3