diff --git a/requirements.txt b/requirements.txt
index b24f1513d..60364ea14 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -39,5 +39,6 @@ python-dateutil>=2.8.0
 SQLAlchemy>=1.3.13
 Flask-Security-Too>=3.0.0
 bcrypt<=3.1.7
+cryptography<=3.0
 sshtunnel>=0.1.5
 ldap3>=2.5.1