diff --git a/requirements_dev.txt b/requirements_dev.txt
index f6413e5..eabd060 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -20,4 +20,4 @@ flake8==3.4.1
 coverage==4.4.1
 Sphinx==1.6.3
 sphinxcontrib-napoleon==0.6.1
-cryptography==2.6.1
+cryptography==42.0.3