diff --git a/setup.py b/setup.py
index 65ede4a6..cf0cb63f 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,8 @@
         "google-api-python-client >= 1.2",
         "oauth2client >= 4.0.0",
         "PyYAML >= 3.0",
-        "httplib2 <= 0.15.0"
+        "httplib2 <= 0.15.0",
+        "pyOpenSSL => 19.1.0"
     ],
     extras_require={
         "tests": ["timeout-decorator"],