diff --git a/requirements_dev.txt b/requirements_dev.txt
index 09890bc..3b4182b 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -7,6 +7,6 @@ tox==3.4.0
 coverage==4.5.3
 Sphinx==3.2.1
 pygments==2.2.0
-cryptography==2.4.1
+cryptography==38.0.0
 PyYAML==5.3.1
 pytest==3.8.0