diff --git a/requirements_dev.txt b/requirements_dev.txt
index 35e787d..6347b3a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,7 +2,7 @@ argparse==1.4.0
 bumpversion==0.5.3
 black==19.10b0
 coverage==5.0.3
-cryptography==2.8
+cryptography==2.9.1
 flask==1.1.1
 mock==4.0.1
 pip==20.0.2