diff --git a/requirements_dev.txt b/requirements_dev.txt
index d3d575c..a4a9a7e 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ flake8==3.5.0
 tox==3.0.0
 Sphinx==1.7.5
 coverage==4.5.1
-cryptography==2.2.2
+cryptography==3.2
 PyYAML==3.12
 pytest==3.6.0
 six==1.11.0