diff --git a/requirements.txt b/requirements.txt
index 9c4c15ff7..267311c7d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ phonenumbers
 pika
 psycopg2-binary
 pygpgme
-pyOpenSSL
+pyOpenSSL==17.5.0
 pytest
 python-ldap
 pytz