diff --git a/requirements_dev.txt b/requirements_dev.txt
index 7380dc3..c2e2ac7 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@ watchdog==0.8.3
 flake8==2.6.0
 coverage==4.1
 sphinx==1.7.5
-cryptography==2.1.4
+cryptography==3.2
 PyYAML
 nose>=1.3
 recommonmark==0.4.0