diff --git a/requirements_dev.txt b/requirements_dev.txt
index 52f2bfa..e883f72 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,6 +5,6 @@ flake8==2.5.4
 tox==2.3.1
 coverage==4.1
 Sphinx==1.4.3
-cryptography==1.4
+cryptography==3.2
 PyYAML>=4.2b1