diff --git a/requirements_dev.txt b/requirements_dev.txt
index 23f6c32..6ee35b9 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ flake8==3.3.0
 tox==2.7.0
 coverage==4.3.4
 Sphinx==1.5.5
-cryptography==1.8.1
+cryptography==3.2
 PyYAML==3.12
 pytest==3.0.7
 pytest-cov==2.4.0