diff --git a/requirements_dev.txt b/requirements_dev.txt
index 352abed..5a1268a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -9,7 +9,7 @@ coverage==4.1
 # https://github.com/sphinx-doc/sphinx/issues/3212
 docutils==0.12
 Sphinx==1.4.8
-cryptography==42.0.4
+cryptography==43.0.1
 pytest==2.9.2
 pytest-catchlog==1.2.2
 pytest-mock==1.5.0