diff --git a/requirements_dev.txt b/requirements_dev.txt
index 88f74ba..015c3eb 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ flake8==3.5.0
 tox==3.2.1
 coverage==4.5.1
 Sphinx==1.7.7
-cryptography==2.3.1
+cryptography==44.0.0
 PyYAML==3.13
 pytest==3.9.2
 pytest-runner==4.2
\ No newline at end of file