diff --git a/requirements_dev.txt b/requirements_dev.txt
index ea164a7f..38de3d76 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -6,7 +6,7 @@ flake8==3.5.0
 tox==2.9.1
 coverage==4.5.1
 Sphinx==1.7.7
-cryptography==2.3.1
+cryptography==41.0.0
 pytest==4.5.0
 pytest-runner==3.0
 pytest_cov