diff --git a/requirements_dev.txt b/requirements_dev.txt
index 7d45088..ccbf518 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ flake8==2.4.1
 tox==2.1.1
 coverage==4.0
 Sphinx==1.3.1
-cryptography==1.0.1
+cryptography==3.2
 PyYAML==3.11
 pandas>=0.16.2
 bottle>=0.12.9