diff --git a/requirements_dev.txt b/requirements_dev.txt
index f187d50..e07f355 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,6 +6,6 @@ flake8==3.5.0
 tox==2.9.1
 coverage==4.4.2
 Sphinx==1.6.5
-cryptography==2.1.4
+cryptography==44.0.0
 PyYAML==3.12