diff --git a/requirements.txt b/requirements.txt
index 2a2c7d0..592e891 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ certifi==2019.11.28
 cffi==1.14.0
 chardet==3.0.4
 click==7.1.1
-cryptography==2.8
+cryptography==39.0.1
 cytoolz==0.10.1
 dropbox==9.5.0
 eth-abi==2.1.1