diff --git a/server/requirements.txt b/server/requirements.txt
index bcf7636f1..1cdf584a0 100644
--- a/server/requirements.txt
+++ b/server/requirements.txt
@@ -18,3 +18,4 @@ WeasyPrint
 webencodings
 xml-marshaller
 pycrypto>=2.6.1
+cryptography==2.9.2