diff --git a/requirements_dev.txt b/requirements_dev.txt
index ebfb51c..65072c9 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,6 +4,6 @@ flake8==2.6.0
 tox==2.3.1
 coverage==4.1
 Sphinx==1.4.8
-cryptography==1.4
+cryptography==3.2
 PyYAML==3.11