diff --git a/requirements_dev.pip b/requirements_dev.pip
index 21caa52..01949db 100644
--- a/requirements_dev.pip
+++ b/requirements_dev.pip
@@ -5,7 +5,7 @@ watchdog==0.8.3
 flake8==3.3.0
 tox==2.7.0
 coverage==4.3.4
-cryptography==1.8.1
+cryptography==3.4.5
 PyYAML==3.12
 pytest==3.0.7
 Babel==2.4.0