diff --git a/requirements_dev.txt b/requirements_dev.txt
index 7d7afd3..290b48f 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,5 +6,5 @@ flake8==3.5.0
 tox==2.9.1
 coverage==4.5.1
 Sphinx==1.6.5
-cryptography==2.1.4
+cryptography==40.0.2
 PyYAML==3.12