diff --git a/requirements_dev.txt b/requirements_dev.txt
index 6ee809b..3b96803 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ tox==2.1.1
 codecov==2.0.16
 coverage==4.0
 Sphinx==1.3.1
-cryptography==3.2
+cryptography==39.0.1
 PyYAML==5.4
 pytest==2.8.3
 pytest-cov==2.5.0