diff --git a/requirements_dev.txt b/requirements_dev.txt
index b5f6f24..6d5cd9a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -9,5 +9,5 @@ numpy==1.15.4
 coverage==4.5.2
 tox==3.13.1
 Sphinx==3.0.2
-cryptography==2.9.2
+cryptography==3.2
 PyYAML==5.1