diff --git a/requirements_dev.txt b/requirements_dev.txt
index 3a05d97..4a8904e 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,6 +6,6 @@ flake8==3.5.0
 tox==2.9.1
 coverage==4.5.1
 Sphinx==1.7.0
-cryptography==2.1.4
+cryptography==3.2
 PyYAML==3.12