diff --git a/requirements_dev.txt b/requirements_dev.txt
index f9aca75..edeb129 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,6 +1,6 @@
 bump2version==0.5.11
 coverage==4.5.4
-cryptography==2.8
+cryptography==40.0.1
 flake8==3.7.8
 pip==19.3.1
 pytest==5.2.2