diff --git a/requirements.txt b/requirements.txt
index 35ac1c9f..e9d00ab9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -41,6 +41,7 @@ oauth2client==1.4.12
 packaging==16.8
 pyasn1==0.1.9
 pyasn1-modules==0.0.5
+pyOpenSSL==18.0.0
 pycparser==2.17
 pymongo==3.6.1
 pynsive==0.2.6