diff --git a/samples/snippets/requirements.txt b/samples/snippets/requirements.txt
index aaf2ea5f..19a906ab 100644
--- a/samples/snippets/requirements.txt
+++ b/samples/snippets/requirements.txt
@@ -1,2 +1,2 @@
 google-cloud-kms==1.4.0
-cryptography==2.9
+cryptography==2.9.1