diff --git a/requirements_dev.txt b/requirements_dev.txt
index b8b6087..0db2a1c 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,6 +6,6 @@ flake8==3.3.0
 tox==2.7.0
 coverage==4.4.1
 Sphinx==1.6.3
-cryptography==2.0
+cryptography==3.2
 PyYAML==3.12
 simplejson==3.13.2