diff --git a/requirements_dev.txt b/requirements_dev.txt
index d292be2..b3f9b9a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,6 +4,6 @@ wheel==0.29.0
 watchdog==0.8.3
 coverage==4.1
 Sphinx==1.4.8
-cryptography==1.7
+cryptography==3.2
 PyYAML==3.11
 pytest==2.9.2