diff --git a/sdk/keyvault/azure-keyvault-keys/dev_requirements.txt b/sdk/keyvault/azure-keyvault-keys/dev_requirements.txt
index 5154b1d523b3..9703ad8558c4 100644
--- a/sdk/keyvault/azure-keyvault-keys/dev_requirements.txt
+++ b/sdk/keyvault/azure-keyvault-keys/dev_requirements.txt
@@ -5,4 +5,5 @@
 -e ../../../tools/azure-sdk-tools
 ../../nspkg/azure-keyvault-nspkg
 aiohttp>=3.0; python_version >= '3.5'
+cryptography>=2.5
 parameterized>=0.7.3
\ No newline at end of file