diff --git a/requirements_dev.txt b/requirements_dev.txt
index 3f5cc38..b05b719 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==2.1.3
 flake8==3.9.0
 tox==3.24.2
 coverage==5.5
-cryptography==3.4.8
+cryptography==35.0.0
 Sphinx==4.1.2
 PyYAML==5.4.1
 pytest==6.2.4