diff --git a/Pipfile b/Pipfile
index 7a76ec5..4efe864 100644
--- a/Pipfile
+++ b/Pipfile
@@ -7,6 +7,7 @@ name = "pypi"
 "google-api-python-client" = "*"
 "httplib2" = "*"
 "oauth2client" = "*"
+"rsa" = ">=4.1"
 
 [dev-packages]